diff --git a/app/components/bulk_upload_error_row_component.html.erb b/app/components/bulk_upload_error_row_component.html.erb
index 65e38613f..4bd303957 100644
--- a/app/components/bulk_upload_error_row_component.html.erb
+++ b/app/components/bulk_upload_error_row_component.html.erb
@@ -13,7 +13,7 @@
     <% if critical_errors.any? %>
       <h2 class="govuk-heading-m">Critical errors</h2>
       <p class="govuk-body">These errors must be fixed to complete your logs.</p>
-      <%= govuk_table do |table| %>
+      <%= govuk_table(html_attributes: { class: potential_errors.any? ? "" : "no-bottom-border" })  do |table| %>
         <%= table.with_head do |head| %>
           <% head.with_row do |row| %>
             <% row.with_cell(header: true, text: "Cell") %>
@@ -39,7 +39,7 @@
     <% if potential_errors.any? %>
       <h2 class="govuk-heading-m">Potential errors</h2>
       <p class="govuk-body">The following groups of cells might have conflicting data. Check the answers and fix any incorrect data.<br><br>If the answers are correct, fix the critical errors and reupload the file. You'll need to confirm that the following data is correct when the file only contains potential errors.</p>
-        <%= govuk_table do |table| %>
+        <%= govuk_table(html_attributes: { class: "no-bottom-border" })  do |table| %>
           <%= table.with_head do |head| %>
             <% head.with_row do |row| %>
               <% row.with_cell(header: true, text: "Cell") %>
@@ -49,24 +49,24 @@
             <% end %>
           <% end %>
 
-          <%= table.with_body do |body| %>
-            <% potential_errors.group_by(&:error).each do |error_message, errors| %>
-              <% errors.each_with_index do |error, index| %>
-                <% row_class = "grouped-rows" %>
-                <% row_class += " first-row" if index.zero? %>
-                <% row_class += " last-row" if index == errors.size - 1 %>
-                <% body.with_row(html_attributes: { class: row_class }) do |row| %>
-                  <% row.with_cell(text: error.cell) %>
-                  <% row.with_cell(text: question_for_field(error.field), html_attributes: { class: "govuk-!-width-one-half" }) %>
-                  <% if index == 0 %>
-                    <% row.with_cell(text: error_message.html_safe, rowspan: errors.size, html_attributes: { class: "govuk-!-font-weight-bold govuk-!-width-one-half grouped-multirow-cell" }) %>
-                  <% end %>
-                  <% row.with_cell(text: error.field.humanize) %>
+        <%= table.with_body do |body| %>
+          <% potential_errors.group_by(&:error).each_with_index do |(error_message, errors), group_index| %>
+            <% total_groups = potential_errors.group_by(&:error).size %>
+            <% errors.each_with_index do |error, index| %>
+              <% row_class = row_classes(index, errors.size) %>
+              <% body.with_row(html_attributes: { class: row_class }) do |row| %>
+                <% row.with_cell(text: error.cell) %>
+                <% row.with_cell(text: question_for_field(error.field), html_attributes: { class: "govuk-!-width-one-half" }) %>
+                <% if index == 0 %>
+                  <% cell_class = cell_classes(group_index, total_groups) %>
+                  <% row.with_cell(text: error_message.html_safe, rowspan: errors.size, html_attributes: { class: cell_class }) %>
                 <% end %>
+                <% row.with_cell(text: error.field.humanize) %>
               <% end %>
             <% end %>
           <% end %>
         <% end %>
+        <% end %>
     <% end %>
   </div>
 </div>
diff --git a/app/components/bulk_upload_error_row_component.rb b/app/components/bulk_upload_error_row_component.rb
index 887eef10c..1cb4de9d8 100644
--- a/app/components/bulk_upload_error_row_component.rb
+++ b/app/components/bulk_upload_error_row_component.rb
@@ -62,4 +62,17 @@ class BulkUploadErrorRowComponent < ViewComponent::Base
   def sales?
     bulk_upload.log_type == "sales"
   end
+
+  def row_classes(index, errors_size)
+    row_class = "grouped-rows"
+    row_class += " first-row" if index.zero?
+    row_class += " last-row" if index == errors_size - 1
+    row_class
+  end
+
+  def cell_classes(group_index, total_groups)
+    cell_class = "govuk-!-font-weight-bold govuk-!-width-one-half"
+    cell_class += " grouped-multirow-cell" unless group_index == total_groups - 1
+    cell_class
+  end
 end
diff --git a/app/controllers/collection_resources_controller.rb b/app/controllers/collection_resources_controller.rb
index ed080c749..5203ceea1 100644
--- a/app/controllers/collection_resources_controller.rb
+++ b/app/controllers/collection_resources_controller.rb
@@ -1,13 +1,15 @@
 class CollectionResourcesController < ApplicationController
   include CollectionResourcesHelper
 
-  before_action :authenticate_user!, except: %i[download_mandatory_collection_resource]
+  before_action :authenticate_user!, except: %i[download_mandatory_collection_resource download_additional_collection_resource]
 
   def index
     render_not_found unless current_user.support?
 
     @mandatory_lettings_collection_resources_per_year = MandatoryCollectionResourcesService.generate_resources("lettings", editable_collection_resource_years)
     @mandatory_sales_collection_resources_per_year = MandatoryCollectionResourcesService.generate_resources("sales", editable_collection_resource_years)
+    @additional_lettings_collection_resources_per_year = CollectionResource.where(log_type: "lettings", mandatory: false).group_by(&:year)
+    @additional_sales_collection_resources_per_year = CollectionResource.where(log_type: "sales", mandatory: false).group_by(&:year)
   end
 
   def download_mandatory_collection_resource
@@ -23,7 +25,16 @@ class CollectionResourcesController < ApplicationController
     download_resource(resource.download_filename)
   end
 
-  def edit
+  def download_additional_collection_resource
+    resource = CollectionResource.find_by(id: params[:collection_resource_id])
+
+    return render_not_found unless resource
+    return render_not_found unless resource_for_year_can_be_downloaded?(resource.year)
+
+    download_resource(resource.download_filename)
+  end
+
+  def edit_mandatory_collection_resource
     return render_not_found unless current_user.support?
 
     year = params[:year].to_i
@@ -39,7 +50,18 @@ class CollectionResourcesController < ApplicationController
     render "collection_resources/edit"
   end
 
-  def update
+  def edit_additional_collection_resource
+    return render_not_found unless current_user.support?
+
+    @collection_resource = CollectionResource.find_by(id: params[:collection_resource_id])
+
+    return render_not_found unless @collection_resource
+    return render_not_found unless resource_for_year_can_be_updated?(@collection_resource.year)
+
+    render "collection_resources/edit"
+  end
+
+  def update_mandatory_collection_resource
     return render_not_found unless current_user.support?
 
     year = resource_params[:year].to_i
@@ -52,7 +74,8 @@ class CollectionResourcesController < ApplicationController
     @collection_resource = MandatoryCollectionResourcesService.generate_resource(log_type, year, resource_type)
     render_not_found unless @collection_resource
 
-    validate_file(file)
+    @collection_resource.file = file
+    @collection_resource.validate_attached_file
 
     return render "collection_resources/edit" if @collection_resource.errors.any?
 
@@ -68,6 +91,36 @@ class CollectionResourcesController < ApplicationController
     redirect_to collection_resources_path
   end
 
+  def update_additional_collection_resource
+    return render_not_found unless current_user.support?
+
+    @collection_resource = CollectionResource.find_by(id: params[:collection_resource_id])
+
+    return render_not_found unless @collection_resource
+    return render_not_found unless resource_for_year_can_be_updated?(@collection_resource.year)
+
+    @collection_resource.file = resource_params[:file]
+    @collection_resource.validate_attached_file
+    @collection_resource.validate_short_display_name
+    return render "collection_resources/edit" if @collection_resource.errors.any?
+
+    @collection_resource.short_display_name = resource_params[:short_display_name]
+    @collection_resource.download_filename = @collection_resource.file&.original_filename
+    @collection_resource.display_name = "#{@collection_resource.log_type} #{@collection_resource.short_display_name} (#{text_year_range_format(@collection_resource.year)})"
+    if @collection_resource.save
+      begin
+        CollectionResourcesService.new.upload_collection_resource(@collection_resource.download_filename, @collection_resource.file)
+        flash[:notice] = "The #{@collection_resource.log_type} #{text_year_range_format(@collection_resource.year)} #{@collection_resource.short_display_name.downcase} has been updated."
+        redirect_to collection_resources_path
+      rescue StandardError
+        @collection_resource.errors.add(:file, :error_uploading)
+        render "collection_resources/edit"
+      end
+    else
+      render "collection_resources/edit"
+    end
+  end
+
   def confirm_mandatory_collection_resources_release
     return render_not_found unless current_user.support?
 
@@ -91,10 +144,50 @@ class CollectionResourcesController < ApplicationController
     redirect_to collection_resources_path
   end
 
+  def new
+    return render_not_found unless current_user.support?
+
+    year = params[:year].to_i
+    log_type = params[:log_type]
+
+    return render_not_found unless editable_collection_resource_years.include?(year)
+
+    @collection_resource = CollectionResource.new(year:, log_type:)
+  end
+
+  def create
+    return render_not_found unless current_user.support? && editable_collection_resource_years.include?(resource_params[:year].to_i)
+
+    @collection_resource = CollectionResource.new(resource_params)
+    @collection_resource.download_filename ||= @collection_resource.file&.original_filename
+    @collection_resource.display_name = "#{@collection_resource.log_type} #{@collection_resource.short_display_name} (#{text_year_range_format(@collection_resource.year)})"
+
+    @collection_resource.validate_attached_file
+    @collection_resource.validate_short_display_name
+    return render "collection_resources/new" if @collection_resource.errors.any?
+
+    if @collection_resource.save
+      begin
+        CollectionResourcesService.new.upload_collection_resource(@collection_resource.download_filename, @collection_resource.file)
+        flash[:notice] = if displayed_collection_resource_years.include?(@collection_resource.year)
+                           "The #{@collection_resource.log_type} #{text_year_range_format(@collection_resource.year)} #{@collection_resource.short_display_name} is now available to users."
+                         else
+                           "The #{@collection_resource.log_type} #{text_year_range_format(@collection_resource.year)} #{@collection_resource.short_display_name} has been uploaded."
+                         end
+        redirect_to collection_resources_path
+      rescue StandardError
+        @collection_resource.errors.add(:file, :error_uploading)
+        render "collection_resources/new"
+      end
+    else
+      render "collection_resources/new"
+    end
+  end
+
 private
 
   def resource_params
-    params.require(:collection_resource).permit(:year, :log_type, :resource_type, :file)
+    params.require(:collection_resource).permit(:year, :log_type, :resource_type, :file, :mandatory, :short_display_name)
   end
 
   def download_resource(filename)
@@ -113,23 +206,4 @@ private
   def resource_for_year_can_be_updated?(year)
     editable_collection_resource_years.include?(year)
   end
-
-  def validate_file(file)
-    return @collection_resource.errors.add(:file, :blank) unless file
-    return @collection_resource.errors.add(:file, :above_100_mb) if file.size > 100.megabytes
-
-    argv = %W[file --brief --mime-type -- #{file.path}]
-    output = `#{argv.shelljoin}`
-
-    case @collection_resource.resource_type
-    when "paper_form"
-      unless output.match?(/application\/pdf/)
-        @collection_resource.errors.add(:file, :must_be_pdf)
-      end
-    when "bulk_upload_template", "bulk_upload_specification"
-      unless output.match?(/application\/vnd\.ms-excel|application\/vnd\.openxmlformats-officedocument\.spreadsheetml\.sheet/)
-        @collection_resource.errors.add(:file, :must_be_xlsx, resource: @collection_resource.short_display_name.downcase)
-      end
-    end
-  end
 end
diff --git a/app/controllers/start_controller.rb b/app/controllers/start_controller.rb
index 5bd49df3f..b65da4d44 100644
--- a/app/controllers/start_controller.rb
+++ b/app/controllers/start_controller.rb
@@ -4,6 +4,8 @@ class StartController < ApplicationController
   def index
     @mandatory_lettings_collection_resources_per_year = MandatoryCollectionResourcesService.generate_resources("lettings", displayed_collection_resource_years)
     @mandatory_sales_collection_resources_per_year = MandatoryCollectionResourcesService.generate_resources("sales", displayed_collection_resource_years)
+    @additional_lettings_collection_resources_per_year = CollectionResource.where(log_type: "lettings", mandatory: false, year: displayed_collection_resource_years).group_by(&:year)
+    @additional_sales_collection_resources_per_year = CollectionResource.where(log_type: "sales", mandatory: false, year: displayed_collection_resource_years).group_by(&:year)
     if current_user
       @homepage_presenter = HomepagePresenter.new(current_user)
       render "home/index"
diff --git a/app/frontend/styles/_bulk-uploads.scss b/app/frontend/styles/_bulk-uploads.scss
index eceae6565..65213ee82 100644
--- a/app/frontend/styles/_bulk-uploads.scss
+++ b/app/frontend/styles/_bulk-uploads.scss
@@ -12,6 +12,11 @@
   border-bottom: 1px solid #b1b4b6;
 }
 
+.no-bottom-border,
+.no-bottom-border > tbody > tr:last-of-type td {
+  border-bottom: none;
+}
+
 .text-normal-break {
   white-space: normal;
   word-break: break-all;
diff --git a/app/helpers/collection_resources_helper.rb b/app/helpers/collection_resources_helper.rb
index 9deb13887..1a5887744 100644
--- a/app/helpers/collection_resources_helper.rb
+++ b/app/helpers/collection_resources_helper.rb
@@ -49,7 +49,7 @@ module CollectionResourcesHelper
   def document_list_component_items(resources)
     resources.map do |resource|
       {
-        name: "Download the #{resource.display_name}",
+        name: "Download the #{resource.display_name.downcase}",
         href: resource.download_path,
         metadata: file_type_size_and_pages(resource.download_filename),
       }
diff --git a/app/models/collection_resource.rb b/app/models/collection_resource.rb
index 81665ccf6..cc217b8cd 100644
--- a/app/models/collection_resource.rb
+++ b/app/models/collection_resource.rb
@@ -3,7 +3,36 @@ class CollectionResource < ApplicationRecord
 
   attr_accessor :file
 
+  validates :short_display_name, presence: true
+
   def download_path
-    download_mandatory_collection_resource_path(log_type:, year:, resource_type:)
+    if mandatory
+      download_mandatory_collection_resource_path(log_type:, year:, resource_type:)
+    else
+      collection_resource_download_path(self)
+    end
+  end
+
+  def validate_attached_file
+    return errors.add(:file, :blank) unless file
+    return errors.add(:file, :above_100_mb) if file.size > 100.megabytes
+
+    argv = %W[file --brief --mime-type -- #{file.path}]
+    output = `#{argv.shelljoin}`
+
+    case resource_type
+    when "paper_form"
+      unless output.match?(/application\/pdf/)
+        errors.add(:file, :must_be_pdf)
+      end
+    when "bulk_upload_template", "bulk_upload_specification"
+      unless output.match?(/application\/vnd\.ms-excel|application\/vnd\.openxmlformats-officedocument\.spreadsheetml\.sheet/)
+        errors.add(:file, :must_be_xlsx, resource: short_display_name.downcase)
+      end
+    end
+  end
+
+  def validate_short_display_name
+    errors.add(:short_display_name, :blank) if short_display_name.blank?
   end
 end
diff --git a/app/models/form/sales/pages/buyer1_income.rb b/app/models/form/sales/pages/buyer1_income.rb
index 943296d2b..657cf8807 100644
--- a/app/models/form/sales/pages/buyer1_income.rb
+++ b/app/models/form/sales/pages/buyer1_income.rb
@@ -2,6 +2,7 @@ class Form::Sales::Pages::Buyer1Income < ::Form::Page
   def initialize(id, hsh, subsection)
     super
     @id = "buyer_1_income"
+    @copy_key = "sales.income_benefits_and_savings.buyer_1_income"
   end
 
   def questions
diff --git a/app/models/form/sales/pages/buyer1_income_max_value_check.rb b/app/models/form/sales/pages/buyer1_income_max_value_check.rb
index b093baa2a..55599ff26 100644
--- a/app/models/form/sales/pages/buyer1_income_max_value_check.rb
+++ b/app/models/form/sales/pages/buyer1_income_max_value_check.rb
@@ -6,8 +6,9 @@ class Form::Sales::Pages::Buyer1IncomeMaxValueCheck < ::Form::Page
         "income1_over_soft_max?" => true,
       },
     ]
+    @copy_key = "sales.soft_validations.income1_value_check.max"
     @title_text = {
-      "translation" => "soft_validations.income.over_soft_max_for_la_buyer_1",
+      "translation" => "forms.#{form.start_date.year}.#{@copy_key}.title_text",
       "arguments" => [
         {
           "key" => "field_formatted_as_currency",
diff --git a/app/models/form/sales/pages/buyer1_income_min_value_check.rb b/app/models/form/sales/pages/buyer1_income_min_value_check.rb
index 2feb4f887..9fc85bb76 100644
--- a/app/models/form/sales/pages/buyer1_income_min_value_check.rb
+++ b/app/models/form/sales/pages/buyer1_income_min_value_check.rb
@@ -6,8 +6,9 @@ class Form::Sales::Pages::Buyer1IncomeMinValueCheck < ::Form::Page
         "income1_under_soft_min?" => true,
       },
     ]
+    @copy_key = "sales.soft_validations.income1_value_check.min"
     @title_text = {
-      "translation" => "soft_validations.income.under_soft_min_for_economic_status.title_text",
+      "translation" => "forms.#{form.start_date.year}.#{@copy_key}.title_text",
       "arguments" => [
         {
           "key" => "field_formatted_as_currency",
@@ -22,7 +23,7 @@ class Form::Sales::Pages::Buyer1IncomeMinValueCheck < ::Form::Page
       ],
     }
     @informative_text = {
-      "translation" => "soft_validations.income.under_soft_min_for_economic_status.hint_text",
+      "translation" => "forms.#{form.start_date.year}.#{@copy_key}.informative_text",
       "arguments" => [],
     }
   end
diff --git a/app/models/form/sales/pages/buyer2_income.rb b/app/models/form/sales/pages/buyer2_income.rb
index f865418a7..fd35d52cc 100644
--- a/app/models/form/sales/pages/buyer2_income.rb
+++ b/app/models/form/sales/pages/buyer2_income.rb
@@ -2,6 +2,7 @@ class Form::Sales::Pages::Buyer2Income < ::Form::Page
   def initialize(id, hsh, subsection)
     super
     @id = "buyer_2_income"
+    @copy_key = "sales.income_benefits_and_savings.buyer_2_income"
     @depends_on = [{
       "joint_purchase?" => true,
     }]
diff --git a/app/models/form/sales/pages/buyer2_income_max_value_check.rb b/app/models/form/sales/pages/buyer2_income_max_value_check.rb
index 894da8799..deece885e 100644
--- a/app/models/form/sales/pages/buyer2_income_max_value_check.rb
+++ b/app/models/form/sales/pages/buyer2_income_max_value_check.rb
@@ -6,8 +6,9 @@ class Form::Sales::Pages::Buyer2IncomeMaxValueCheck < ::Form::Page
         "income2_over_soft_max?" => true,
       },
     ]
+    @copy_key = "sales.soft_validations.income2_value_check.max"
     @title_text = {
-      "translation" => "soft_validations.income.over_soft_max_for_la_buyer_2",
+      "translation" => "forms.#{form.start_date.year}.#{@copy_key}.title_text",
       "arguments" => [
         {
           "key" => "field_formatted_as_currency",
diff --git a/app/models/form/sales/pages/buyer2_income_min_value_check.rb b/app/models/form/sales/pages/buyer2_income_min_value_check.rb
index adef17843..a7b68cd10 100644
--- a/app/models/form/sales/pages/buyer2_income_min_value_check.rb
+++ b/app/models/form/sales/pages/buyer2_income_min_value_check.rb
@@ -6,8 +6,9 @@ class Form::Sales::Pages::Buyer2IncomeMinValueCheck < ::Form::Page
         "income2_under_soft_min?" => true,
       },
     ]
+    @copy_key = "sales.soft_validations.income2_value_check.min"
     @title_text = {
-      "translation" => "soft_validations.income.under_soft_min_for_economic_status.title_text",
+      "translation" => "forms.#{form.start_date.year}.#{@copy_key}.title_text",
       "arguments" => [
         {
           "key" => "field_formatted_as_currency",
@@ -22,7 +23,7 @@ class Form::Sales::Pages::Buyer2IncomeMinValueCheck < ::Form::Page
       ],
     }
     @informative_text = {
-      "translation" => "soft_validations.income.under_soft_min_for_economic_status.hint_text",
+      "translation" => "forms.#{form.start_date.year}.#{@copy_key}.informative_text",
       "arguments" => [],
     }
   end
diff --git a/app/models/form/sales/pages/combined_income_max_value_check.rb b/app/models/form/sales/pages/combined_income_max_value_check.rb
index 82f2e4469..1cd1fd851 100644
--- a/app/models/form/sales/pages/combined_income_max_value_check.rb
+++ b/app/models/form/sales/pages/combined_income_max_value_check.rb
@@ -6,8 +6,9 @@ class Form::Sales::Pages::CombinedIncomeMaxValueCheck < ::Form::Page
         "combined_income_over_soft_max?" => true,
       },
     ]
+    @copy_key = "sales.soft_validations.combined_income_value_check"
     @title_text = {
-      "translation" => "soft_validations.income.over_soft_max_for_la_combined",
+      "translation" => "forms.#{form.start_date.year}.#{@copy_key}.title_text",
       "arguments" => [
         {
           "key" => "field_formatted_as_currency",
diff --git a/app/models/form/sales/pages/deposit_value_check.rb b/app/models/form/sales/pages/deposit_value_check.rb
index cca25a43b..cbec4b031 100644
--- a/app/models/form/sales/pages/deposit_value_check.rb
+++ b/app/models/form/sales/pages/deposit_value_check.rb
@@ -1,12 +1,13 @@
 class Form::Sales::Pages::DepositValueCheck < ::Form::Page
   def initialize(id, hsh, subsection, joint_purchase:)
     super(id, hsh, subsection)
+    @copy_key = "sales.soft_validations.deposit_value_check.#{joint_purchase ? 'joint_purchase' : 'not_joint_purchase'}"
     @informative_text = {
-      "translation" => "soft_validations.deposit.hint_text",
+      "translation" => "forms.#{form.start_date.year}.#{@copy_key}.informative_text",
       "arguments" => [],
     }
     @title_text = {
-      "translation" => "soft_validations.deposit.title_text.#{joint_purchase ? 'two' : 'one'}",
+      "translation" => "forms.#{form.start_date.year}.#{@copy_key}.title_text",
       "arguments" => [
         {
           "key" => "field_formatted_as_currency",
diff --git a/app/models/form/sales/pages/housing_benefits.rb b/app/models/form/sales/pages/housing_benefits.rb
index 90d721ad8..c40dff5f4 100644
--- a/app/models/form/sales/pages/housing_benefits.rb
+++ b/app/models/form/sales/pages/housing_benefits.rb
@@ -2,6 +2,7 @@ class Form::Sales::Pages::HousingBenefits < ::Form::Page
   def initialize(id, hsh, subsection, joint_purchase:)
     super(id, hsh, subsection)
     @joint_purchase = joint_purchase
+    @copy_key = "sales.income_benefits_and_savings.housing_benefits.#{joint_purchase ? 'joint_purchase' : 'not_joint_purchase'}"
   end
 
   def questions
diff --git a/app/models/form/sales/pages/mortgage_value_check.rb b/app/models/form/sales/pages/mortgage_value_check.rb
index 949cea27f..bfab9a014 100644
--- a/app/models/form/sales/pages/mortgage_value_check.rb
+++ b/app/models/form/sales/pages/mortgage_value_check.rb
@@ -2,10 +2,10 @@ class Form::Sales::Pages::MortgageValueCheck < ::Form::Page
   def initialize(id, hsh, subsection, person_index = nil)
     super(id, hsh, subsection)
     @depends_on = depends_on
-    @informative_text = {}
     @person_index = person_index
+    @copy_key = "sales.soft_validations.mortgage_value_check"
     @title_text = {
-      "translation" => "soft_validations.mortgage.title_text",
+      "translation" => "forms.#{form.start_date.year}.#{@copy_key}.title_text",
       "arguments" => [
         {
           "key" => "field_formatted_as_currency",
@@ -15,7 +15,7 @@ class Form::Sales::Pages::MortgageValueCheck < ::Form::Page
       ],
     }
     @informative_text = {
-      "translation" => "soft_validations.mortgage.hint_text",
+      "translation" => "forms.#{form.start_date.year}.#{@copy_key}.informative_text",
       "arguments" => [],
     }
   end
diff --git a/app/models/form/sales/pages/previous_ownership.rb b/app/models/form/sales/pages/previous_ownership.rb
index 50711baf7..ac7a17787 100644
--- a/app/models/form/sales/pages/previous_ownership.rb
+++ b/app/models/form/sales/pages/previous_ownership.rb
@@ -3,6 +3,7 @@ class Form::Sales::Pages::PreviousOwnership < ::Form::Page
     super(id, hsh, subsection)
     @joint_purchase = joint_purchase
     @depends_on = [{ "joint_purchase?" => @joint_purchase }]
+    @copy_key = "sales.income_benefits_and_savings.prevown.#{joint_purchase ? 'joint_purchase' : 'not_joint_purchase'}"
   end
 
   def questions
diff --git a/app/models/form/sales/pages/savings.rb b/app/models/form/sales/pages/savings.rb
index 7a13dbe34..64a2b1ecf 100644
--- a/app/models/form/sales/pages/savings.rb
+++ b/app/models/form/sales/pages/savings.rb
@@ -2,6 +2,7 @@ class Form::Sales::Pages::Savings < ::Form::Page
   def initialize(id, hsh, subsection, joint_purchase:)
     super(id, hsh, subsection)
     @joint_purchase = joint_purchase
+    @copy_key = "sales.income_benefits_and_savings.savings.#{joint_purchase ? 'joint_purchase' : 'not_joint_purchase'}"
   end
 
   def questions
diff --git a/app/models/form/sales/pages/savings_value_check.rb b/app/models/form/sales/pages/savings_value_check.rb
index bcb95abc9..00be6decd 100644
--- a/app/models/form/sales/pages/savings_value_check.rb
+++ b/app/models/form/sales/pages/savings_value_check.rb
@@ -1,8 +1,9 @@
 class Form::Sales::Pages::SavingsValueCheck < ::Form::Page
   def initialize(id, hsh, subsection, joint_purchase:)
     super(id, hsh, subsection)
+    @copy_key = "sales.soft_validations.savings_value_check.#{joint_purchase ? 'joint_purchase' : 'not_joint_purchase'}"
     @title_text = {
-      "translation" => "soft_validations.savings.title_text.#{joint_purchase ? 'two' : 'one'}",
+      "translation" => "forms.#{form.start_date.year}.#{@copy_key}.title_text",
       "arguments" => [
         {
           "key" => "field_formatted_as_currency",
@@ -12,7 +13,7 @@ class Form::Sales::Pages::SavingsValueCheck < ::Form::Page
       ],
     }
     @informative_text = {
-      "translation" => "soft_validations.savings.hint_text",
+      "translation" => "forms.#{form.start_date.year}.#{@copy_key}.informative_text",
       "arguments" => [],
     }
     @joint_purchase = joint_purchase
diff --git a/app/models/form/sales/questions/buyer1_income.rb b/app/models/form/sales/questions/buyer1_income.rb
index 106f040f8..3f1159a8f 100644
--- a/app/models/form/sales/questions/buyer1_income.rb
+++ b/app/models/form/sales/questions/buyer1_income.rb
@@ -2,9 +2,7 @@ class Form::Sales::Questions::Buyer1Income < ::Form::Question
   def initialize(id, hsh, page)
     super
     @id = "income1"
-    @check_answer_label = "Buyer 1’s gross annual income"
-    @header = "Buyer 1’s gross annual income"
-    @hint_text = "Provide the gross annual income (i.e. salary before tax) plus the annual amount of benefits, Universal Credit or pensions, and income from investments."
+    @copy_key = "sales.income_benefits_and_savings.buyer_1_income.income1"
     @type = "numeric"
     @min = 0
     @max = 999_999
diff --git a/app/models/form/sales/questions/buyer1_income_known.rb b/app/models/form/sales/questions/buyer1_income_known.rb
index b00b45475..46c1f4caa 100644
--- a/app/models/form/sales/questions/buyer1_income_known.rb
+++ b/app/models/form/sales/questions/buyer1_income_known.rb
@@ -2,8 +2,7 @@ class Form::Sales::Questions::Buyer1IncomeKnown < ::Form::Question
   def initialize(id, hsh, page)
     super
     @id = "income1nk"
-    @check_answer_label = "Buyer 1’s gross annual income known?"
-    @header = "Do you know buyer 1’s annual income?"
+    @copy_key = "sales.income_benefits_and_savings.buyer_1_income.income1nk"
     @type = "radio"
     @answer_options = ANSWER_OPTIONS
     @conditional_for = {
diff --git a/app/models/form/sales/questions/buyer1_income_value_check.rb b/app/models/form/sales/questions/buyer1_income_value_check.rb
index 63e3b6478..410bd53d5 100644
--- a/app/models/form/sales/questions/buyer1_income_value_check.rb
+++ b/app/models/form/sales/questions/buyer1_income_value_check.rb
@@ -2,8 +2,7 @@ class Form::Sales::Questions::Buyer1IncomeValueCheck < ::Form::Question
   def initialize(id, hsh, page, check_answers_card_number:)
     super(id, hsh, page)
     @id = "income1_value_check"
-    @check_answer_label = "Buyer 1 income confirmation"
-    @header = "Are you sure this is correct?"
+    @copy_key = "sales.soft_validations.income1_value_check"
     @type = "interruption_screen"
     @answer_options = {
       "0" => { "value" => "Yes" },
diff --git a/app/models/form/sales/questions/buyer1_mortgage.rb b/app/models/form/sales/questions/buyer1_mortgage.rb
index eaa2a07fa..d2a94f6b5 100644
--- a/app/models/form/sales/questions/buyer1_mortgage.rb
+++ b/app/models/form/sales/questions/buyer1_mortgage.rb
@@ -2,8 +2,6 @@ class Form::Sales::Questions::Buyer1Mortgage < ::Form::Question
   def initialize(id, hsh, page)
     super
     @id = "inc1mort"
-    @check_answer_label = "Buyer 1’s income used for mortgage application"
-    @header = "Was buyer 1’s income used for a mortgage application?"
     @type = "radio"
     @answer_options = ANSWER_OPTIONS
     @check_answers_card_number = 1
diff --git a/app/models/form/sales/questions/buyer2_income.rb b/app/models/form/sales/questions/buyer2_income.rb
index cff25b344..39777f870 100644
--- a/app/models/form/sales/questions/buyer2_income.rb
+++ b/app/models/form/sales/questions/buyer2_income.rb
@@ -2,10 +2,8 @@ class Form::Sales::Questions::Buyer2Income < ::Form::Question
   def initialize(id, hsh, page)
     super
     @id = "income2"
-    @check_answer_label = "Buyer 2’s gross annual income"
-    @header = "Buyer 2’s gross annual income"
+    @copy_key = "sales.income_benefits_and_savings.buyer_2_income.income2"
     @type = "numeric"
-    @hint_text = "Provide the gross annual income (i.e. salary before tax) plus the annual amount of benefits, Universal Credit or pensions, and income from investments."
     @min = 0
     @max = 999_999
     @step = 1
diff --git a/app/models/form/sales/questions/buyer2_income_known.rb b/app/models/form/sales/questions/buyer2_income_known.rb
index b3cc5f33a..0b125f2af 100644
--- a/app/models/form/sales/questions/buyer2_income_known.rb
+++ b/app/models/form/sales/questions/buyer2_income_known.rb
@@ -2,8 +2,7 @@ class Form::Sales::Questions::Buyer2IncomeKnown < ::Form::Question
   def initialize(id, hsh, page)
     super
     @id = "income2nk"
-    @check_answer_label = "Buyer 2’s gross annual income known?"
-    @header = "Do you know buyer 2’s annual income?"
+    @copy_key = "sales.income_benefits_and_savings.buyer_2_income.income2"
     @type = "radio"
     @answer_options = ANSWER_OPTIONS
     @conditional_for = {
diff --git a/app/models/form/sales/questions/buyer2_income_value_check.rb b/app/models/form/sales/questions/buyer2_income_value_check.rb
index 37b6cb380..6b0bab5c2 100644
--- a/app/models/form/sales/questions/buyer2_income_value_check.rb
+++ b/app/models/form/sales/questions/buyer2_income_value_check.rb
@@ -2,8 +2,7 @@ class Form::Sales::Questions::Buyer2IncomeValueCheck < ::Form::Question
   def initialize(id, hsh, page, check_answers_card_number:)
     super(id, hsh, page)
     @id = "income2_value_check"
-    @check_answer_label = "Buyer 2 income confirmation"
-    @header = "Are you sure this is correct?"
+    @copy_key = "sales.soft_validations.income2_value_check"
     @type = "interruption_screen"
     @answer_options = {
       "0" => { "value" => "Yes" },
diff --git a/app/models/form/sales/questions/buyer2_mortgage.rb b/app/models/form/sales/questions/buyer2_mortgage.rb
index 42b8cda06..415d5b714 100644
--- a/app/models/form/sales/questions/buyer2_mortgage.rb
+++ b/app/models/form/sales/questions/buyer2_mortgage.rb
@@ -2,8 +2,6 @@ class Form::Sales::Questions::Buyer2Mortgage < ::Form::Question
   def initialize(id, hsh, page)
     super
     @id = "inc2mort"
-    @check_answer_label = "Buyer 2’s income used for mortgage application"
-    @header = "Was buyer 2’s income used for a mortgage application?"
     @type = "radio"
     @answer_options = ANSWER_OPTIONS
     @check_answers_card_number = 2
diff --git a/app/models/form/sales/questions/combined_income_value_check.rb b/app/models/form/sales/questions/combined_income_value_check.rb
index 47cafeaa2..c2688ffe5 100644
--- a/app/models/form/sales/questions/combined_income_value_check.rb
+++ b/app/models/form/sales/questions/combined_income_value_check.rb
@@ -2,8 +2,7 @@ class Form::Sales::Questions::CombinedIncomeValueCheck < ::Form::Question
   def initialize(id, hsh, page, check_answers_card_number:)
     super(id, hsh, page)
     @id = "combined_income_value_check"
-    @check_answer_label = "Combined income confirmation"
-    @header = "Are you sure this is correct?"
+    @copy_key = "sales.soft_validations.combined_income_value_check"
     @type = "interruption_screen"
     @answer_options = {
       "0" => { "value" => "Yes" },
diff --git a/app/models/form/sales/questions/deposit_value_check.rb b/app/models/form/sales/questions/deposit_value_check.rb
index f3cd27e3a..f8d403d9c 100644
--- a/app/models/form/sales/questions/deposit_value_check.rb
+++ b/app/models/form/sales/questions/deposit_value_check.rb
@@ -2,8 +2,7 @@ class Form::Sales::Questions::DepositValueCheck < ::Form::Question
   def initialize(id, hsh, page)
     super
     @id = "deposit_value_check"
-    @check_answer_label = "Deposit confirmation"
-    @header = "Are you sure that the deposit is this much higher than the buyer's savings?"
+    @copy_key = "sales.soft_validations.deposit_value_check"
     @type = "interruption_screen"
     @answer_options = {
       "0" => { "value" => "Yes" },
diff --git a/app/models/form/sales/questions/housing_benefits.rb b/app/models/form/sales/questions/housing_benefits.rb
index 70bc4ba2e..d7a670f2e 100644
--- a/app/models/form/sales/questions/housing_benefits.rb
+++ b/app/models/form/sales/questions/housing_benefits.rb
@@ -2,8 +2,7 @@ class Form::Sales::Questions::HousingBenefits < ::Form::Question
   def initialize(id, hsh, page, joint_purchase:)
     super(id, hsh, page)
     @id = "hb"
-    @check_answer_label = "Housing-related benefits #{joint_purchase ? 'buyers' : 'buyer'} received before buying this property"
-    @header = "#{joint_purchase ? 'Were the buyers' : 'Was the buyer'} receiving any of these housing-related benefits immediately before buying this property?"
+    @copy_key = "sales.income_benefits_and_savings.housing_benefits.#{joint_purchase ? 'joint_purchase' : 'not_joint_purchase'}"
     @type = "radio"
     @answer_options = ANSWER_OPTIONS
     @question_number = QUESTION_NUMBER_FROM_YEAR[form.start_date.year] || QUESTION_NUMBER_FROM_YEAR[QUESTION_NUMBER_FROM_YEAR.keys.max]
diff --git a/app/models/form/sales/questions/mortgage_value_check.rb b/app/models/form/sales/questions/mortgage_value_check.rb
index 39079d40e..99307ab38 100644
--- a/app/models/form/sales/questions/mortgage_value_check.rb
+++ b/app/models/form/sales/questions/mortgage_value_check.rb
@@ -2,8 +2,7 @@ class Form::Sales::Questions::MortgageValueCheck < ::Form::Question
   def initialize(id, hsh, page)
     super
     @id = "mortgage_value_check"
-    @check_answer_label = "Mortgage confirmation"
-    @header = "Are you sure that the mortgage is more than 5 times the income used for the mortgage application?"
+    @copy_key = "sales.soft_validations.mortgage_value_check"
     @type = "interruption_screen"
     @answer_options = {
       "0" => { "value" => "Yes" },
diff --git a/app/models/form/sales/questions/prevown.rb b/app/models/form/sales/questions/prevown.rb
index f913f950b..ecd6c9071 100644
--- a/app/models/form/sales/questions/prevown.rb
+++ b/app/models/form/sales/questions/prevown.rb
@@ -2,8 +2,7 @@ class Form::Sales::Questions::Prevown < ::Form::Question
   def initialize(id, hsh, page, joint_purchase:)
     super(id, hsh, page)
     @id = "prevown"
-    @check_answer_label = I18n.t("check_answer_labels.prevown", count: joint_purchase ? 2 : 1)
-    @header = I18n.t("questions.prevown", count: joint_purchase ? 2 : 1)
+    @copy_key = "sales.income_benefits_and_savings.prevown.#{joint_purchase ? 'joint_purchase' : 'not_joint_purchase'}"
     @type = "radio"
     @answer_options = ANSWER_OPTIONS
     @question_number = QUESTION_NUMBER_FROM_YEAR[form.start_date.year] || QUESTION_NUMBER_FROM_YEAR[QUESTION_NUMBER_FROM_YEAR.keys.max]
diff --git a/app/models/form/sales/questions/prevshared.rb b/app/models/form/sales/questions/prevshared.rb
index 018f57faa..f4ced14b9 100644
--- a/app/models/form/sales/questions/prevshared.rb
+++ b/app/models/form/sales/questions/prevshared.rb
@@ -2,11 +2,8 @@ class Form::Sales::Questions::Prevshared < ::Form::Question
   def initialize(id, hsh, page)
     super
     @id = "prevshared"
-    @check_answer_label = "Previous property shared ownership?"
-    @header = "Was the previous property under shared ownership?"
     @type = "radio"
     @answer_options = ANSWER_OPTIONS
-    @hint_text = "For any buyer"
     @question_number = QUESTION_NUMBER_FROM_YEAR[form.start_date.year] || QUESTION_NUMBER_FROM_YEAR[QUESTION_NUMBER_FROM_YEAR.keys.max]
   end
 
diff --git a/app/models/form/sales/questions/savings.rb b/app/models/form/sales/questions/savings.rb
index 82b8e0f87..bb1f939a5 100644
--- a/app/models/form/sales/questions/savings.rb
+++ b/app/models/form/sales/questions/savings.rb
@@ -2,8 +2,7 @@ class Form::Sales::Questions::Savings < ::Form::Question
   def initialize(id, hsh, page, joint_purchase:)
     super(id, hsh, page)
     @id = "savings"
-    @check_answer_label = "#{joint_purchase ? 'Buyers’' : 'Buyer’s'} total savings before any deposit paid"
-    @header = "Enter their total savings to the nearest £10"
+    @copy_key = "sales.income_benefits_and_savings.savings.#{joint_purchase ? 'joint_purchase' : 'not_joint_purchase'}.savings"
     @type = "numeric"
     @width = 5
     @prefix = "£"
diff --git a/app/models/form/sales/questions/savings_nk.rb b/app/models/form/sales/questions/savings_nk.rb
index 931ba835a..3c7e115f4 100644
--- a/app/models/form/sales/questions/savings_nk.rb
+++ b/app/models/form/sales/questions/savings_nk.rb
@@ -2,8 +2,7 @@ class Form::Sales::Questions::SavingsNk < ::Form::Question
   def initialize(id, hsh, page, joint_purchase:)
     super(id, hsh, page)
     @id = "savingsnk"
-    @check_answer_label = "#{joint_purchase ? 'Buyers’' : 'Buyer’s'} total savings known?"
-    @header = "Do you know how much the #{joint_purchase ? 'buyers' : 'buyer'} had in savings before they paid any deposit for the property?"
+    @copy_key = "sales.income_benefits_and_savings.savings.#{joint_purchase ? 'joint_purchase' : 'not_joint_purchase'}.savingsnk"
     @type = "radio"
     @answer_options = ANSWER_OPTIONS
     @conditional_for = {
diff --git a/app/models/form/sales/questions/savings_value_check.rb b/app/models/form/sales/questions/savings_value_check.rb
index bcd16827a..f547969bf 100644
--- a/app/models/form/sales/questions/savings_value_check.rb
+++ b/app/models/form/sales/questions/savings_value_check.rb
@@ -2,8 +2,7 @@ class Form::Sales::Questions::SavingsValueCheck < ::Form::Question
   def initialize(id, hsh, page)
     super
     @id = "savings_value_check"
-    @check_answer_label = "Savings confirmation"
-    @header = "Are you sure the savings are higher than £100,000?"
+    @copy_key = "sales.soft_validations.savings_value_check"
     @type = "interruption_screen"
     @answer_options = {
       "0" => { "value" => "Yes" },
diff --git a/app/models/form/sales/questions/uprn.rb b/app/models/form/sales/questions/uprn.rb
index 75a41a0ec..94aaccb43 100644
--- a/app/models/form/sales/questions/uprn.rb
+++ b/app/models/form/sales/questions/uprn.rb
@@ -16,7 +16,7 @@ class Form::Sales::Questions::Uprn < ::Form::Question
   end
 
   def unanswered_error_message
-    I18n.t("validations.property.uprn.invalid")
+    I18n.t("validations.sales.property_information.uprn.invalid")
   end
 
   def get_extra_check_answer_value(log)
diff --git a/app/models/form/sales/questions/uprn_known.rb b/app/models/form/sales/questions/uprn_known.rb
index 44ce03cad..fdd0c9e9a 100644
--- a/app/models/form/sales/questions/uprn_known.rb
+++ b/app/models/form/sales/questions/uprn_known.rb
@@ -31,7 +31,7 @@ class Form::Sales::Questions::UprnKnown < ::Form::Question
   }.freeze
 
   def unanswered_error_message
-    I18n.t("validations.property.uprn_known.invalid")
+    I18n.t("validations.sales.property_information.uprn_known.invalid")
   end
 
   QUESTION_NUMBER_FROM_YEAR = { 2023 => 14, 2024 => 15 }.freeze
diff --git a/app/models/validations/sales/household_validations.rb b/app/models/validations/sales/household_validations.rb
index e006374aa..fb1ea65c2 100644
--- a/app/models/validations/sales/household_validations.rb
+++ b/app/models/validations/sales/household_validations.rb
@@ -9,9 +9,9 @@ module Validations::Sales::HouseholdValidations
     return unless record.form.start_date.year >= 2023
 
     if record.buyers_will_live_in? && record.buyer_one_will_not_live_in_property? && record.buyer_two_will_not_live_in_property?
-      record.errors.add :buylivein, I18n.t("validations.household.buylivein.buyers_will_live_in_property_values_inconsistent_setup")
-      record.errors.add :buy1livein, I18n.t("validations.household.buylivein.buyers_will_live_in_property_values_inconsistent")
-      record.errors.add :buy2livein, I18n.t("validations.household.buylivein.buyers_will_live_in_property_values_inconsistent")
+      record.errors.add :buylivein, I18n.t("validations.sales.household.buylivein.buyers_will_live_in_property_values_inconsistent")
+      record.errors.add :buy1livein, I18n.t("validations.sales.household.buy1livein.buyers_will_live_in_property_values_inconsistent")
+      record.errors.add :buy2livein, I18n.t("validations.sales.household.buy2livein.buyers_will_live_in_property_values_inconsistent")
     end
   end
 
@@ -20,8 +20,8 @@ module Validations::Sales::HouseholdValidations
     return unless record.discounted_ownership_sale? && record.prevten
 
     if [3, 4, 5, 6, 7, 9, 0].include?(record.prevten)
-      record.errors.add :prevten, I18n.t("validations.household.prevten.invalid_for_discounted_sale")
-      record.errors.add :ownershipsch, I18n.t("validations.household.prevten.invalid_for_discounted_sale")
+      record.errors.add :prevten, I18n.t("validations.sales.household.prevten.prevten_invalid_for_discounted_sale")
+      record.errors.add :ownershipsch, I18n.t("validations.sales.household.ownershipsch.prevten_invalid_for_discounted_sale")
     end
   end
 
@@ -34,11 +34,11 @@ module Validations::Sales::HouseholdValidations
       next unless age && relationship
 
       if age < 16 && !relationship_is_child_other_or_refused?(relationship)
-        record.errors.add "age#{person_num}", I18n.t("validations.household.age.child_under_16_relat_sales", person_num:)
-        record.errors.add "relat#{person_num}", I18n.t("validations.household.relat.child_under_16_sales", person_num:)
+        record.errors.add "age#{person_num}", I18n.t("validations.sales.household.age.child_under_16", person_num:)
+        record.errors.add "relat#{person_num}", I18n.t("validations.sales.household.relat.child_under_16", person_num:)
       elsif age >= 20 && person_is_child?(relationship)
-        record.errors.add "age#{person_num}", I18n.t("validations.household.age.child_over_20")
-        record.errors.add "relat#{person_num}", I18n.t("validations.household.relat.child_over_20")
+        record.errors.add "age#{person_num}", I18n.t("validations.sales.household.age.child_over_20")
+        record.errors.add "relat#{person_num}", I18n.t("validations.sales.household.relat.child_over_20")
       end
     end
   end
@@ -58,16 +58,16 @@ module Validations::Sales::HouseholdValidations
       child = person_is_child?(relationship)
 
       if age_between_16_19 && !(student || economic_status_refused) && child
-        record.errors.add "ecstat#{person_num}", I18n.t("validations.household.ecstat.student_16_19.must_be_student")
-        record.errors.add "age#{person_num}", I18n.t("validations.household.age.student_16_19.cannot_be_16_19.child_not_student")
-        record.errors.add "relat#{person_num}", I18n.t("validations.household.relat.student_16_19.cannot_be_child.16_19_not_student")
+        record.errors.add "ecstat#{person_num}", I18n.t("validations.sales.household.ecstat.student_16_19.must_be_student")
+        record.errors.add "age#{person_num}", I18n.t("validations.sales.household.age.student_16_19.cannot_be_16_19.child_not_student")
+        record.errors.add "relat#{person_num}", I18n.t("validations.sales.household.relat.student_16_19.cannot_be_child.16_19_not_student")
       end
 
       next unless !age_between_16_19 && student && child
 
-      record.errors.add "age#{person_num}", I18n.t("validations.household.age.student_16_19.must_be_16_19")
-      record.errors.add "ecstat#{person_num}", I18n.t("validations.household.ecstat.student_16_19.cannot_be_student.child_not_16_19")
-      record.errors.add "relat#{person_num}", I18n.t("validations.household.relat.student_16_19.cannot_be_child.student_not_16_19")
+      record.errors.add "age#{person_num}", I18n.t("validations.sales.household.age.student_16_19.must_be_16_19")
+      record.errors.add "ecstat#{person_num}", I18n.t("validations.sales.household.ecstat.student_16_19.cannot_be_student.child_not_16_19")
+      record.errors.add "relat#{person_num}", I18n.t("validations.sales.household.relat.student_16_19.cannot_be_child.student_not_16_19")
     end
   end
 
@@ -78,12 +78,12 @@ module Validations::Sales::HouseholdValidations
       next unless age && economic_status
 
       if age < 16 && !economic_status_is_child_other_or_refused?(economic_status) && !record.form.start_year_after_2024?
-        record.errors.add "ecstat#{person_num}", I18n.t("validations.household.ecstat.child_under_16", person_num:)
-        record.errors.add "age#{person_num}", I18n.t("validations.household.age.child_under_16_ecstat", person_num:)
+        record.errors.add "ecstat#{person_num}", I18n.t("validations.sales.household.ecstat.child_under_16", person_num:)
+        record.errors.add "age#{person_num}", I18n.t("validations.sales.household.age.child_under_16_ecstat", person_num:)
       end
       if person_is_economic_child?(economic_status) && age > 16
-        record.errors.add "ecstat#{person_num}", I18n.t("validations.household.ecstat.child_over_16", person_num:)
-        record.errors.add "age#{person_num}", I18n.t("validations.household.age.child_over_16", person_num:)
+        record.errors.add "ecstat#{person_num}", I18n.t("validations.sales.household.ecstat.child_over_16", person_num:)
+        record.errors.add "age#{person_num}", I18n.t("validations.sales.household.age.child_over_16", person_num:)
       end
     end
   end
@@ -99,17 +99,17 @@ module Validations::Sales::HouseholdValidations
 
       next unless person_age > buyer_1_age - 12 && person_is_child?(relationship)
 
-      record.errors.add "age1", I18n.t("validations.household.age.child_12_years_younger")
-      record.errors.add "age#{person_num}", I18n.t("validations.household.age.child_12_years_younger")
-      record.errors.add "relat#{person_num}", I18n.t("validations.household.age.child_12_years_younger")
+      record.errors.add "age1", I18n.t("validations.sales.household.age1.child_12_years_younger")
+      record.errors.add "age#{person_num}", I18n.t("validations.sales.household.age.child_12_years_younger")
+      record.errors.add "relat#{person_num}", I18n.t("validations.sales.household.relat.child_12_years_younger")
     end
   end
 
   def validate_buyer_not_child(record)
     return unless record.saledate && record.form.start_year_after_2024?
 
-    record.errors.add "ecstat1", I18n.t("validations.household.ecstat.buyer_cannot_be_child", buyer_index: "1") if person_is_economic_child?(record.ecstat1)
-    record.errors.add "ecstat2", I18n.t("validations.household.ecstat.buyer_cannot_be_child", buyer_index: "2") if person_is_economic_child?(record.ecstat2) && record.joint_purchase?
+    record.errors.add "ecstat1", I18n.t("validations.sales.household.ecstat1.buyer_cannot_be_child") if person_is_economic_child?(record.ecstat1)
+    record.errors.add "ecstat2", I18n.t("validations.sales.household.ecstat2.buyer_cannot_be_child") if person_is_economic_child?(record.ecstat2) && record.joint_purchase?
   end
 
 private
diff --git a/app/models/validations/sales/property_validations.rb b/app/models/validations/sales/property_validations.rb
index 50818c422..59d616c9a 100644
--- a/app/models/validations/sales/property_validations.rb
+++ b/app/models/validations/sales/property_validations.rb
@@ -4,10 +4,11 @@ module Validations::Sales::PropertyValidations
     return unless record.ppostcode_full.present? && record.postcode_full.present?
 
     if record.discounted_ownership_sale? && record.ppostcode_full != record.postcode_full
-      record.errors.add :postcode_full, I18n.t("validations.property.postcode.must_match_previous", buyer_possessive: record.joint_purchase? ? "Buyers’" : "Buyer’s")
-      record.errors.add :ppostcode_full, I18n.t("validations.property.postcode.must_match_previous", buyer_possessive: record.joint_purchase? ? "Buyers’" : "Buyer’s")
-      record.errors.add :ownershipsch, I18n.t("validations.property.postcode.must_match_previous", buyer_possessive: record.joint_purchase? ? "Buyers’" : "Buyer’s")
-      record.errors.add :uprn, I18n.t("validations.property.postcode.must_match_previous", buyer_possessive: record.joint_purchase? ? "Buyers’" : "Buyer’s")
+      joint_purchase_id = record.joint_purchase? ? "joint_purchase" : "not_joint_purchase"
+      record.errors.add :postcode_full, I18n.t("validations.sales.property_information.postcode_full.postcode_must_match_previous.#{joint_purchase_id}")
+      record.errors.add :ppostcode_full, I18n.t("validations.sales.property_information.ppostcode_full.postcode_must_match_previous.#{joint_purchase_id}")
+      record.errors.add :ownershipsch, I18n.t("validations.sales.property_information.ownershipsch.postcode_must_match_previous.#{joint_purchase_id}")
+      record.errors.add :uprn, I18n.t("validations.sales.property_information.uprn.postcode_must_match_previous.#{joint_purchase_id}")
     end
   end
 
@@ -15,8 +16,8 @@ module Validations::Sales::PropertyValidations
     return unless record.proptype.present? && record.beds.present?
 
     if record.is_bedsit? && record.beds > 1
-      record.errors.add :proptype, I18n.t("validations.property.proptype.bedsits_have_max_one_bedroom")
-      record.errors.add :beds, I18n.t("validations.property.beds.bedsits_have_max_one_bedroom")
+      record.errors.add :proptype, I18n.t("validations.sales.property_information.proptype.bedsits_have_max_one_bedroom")
+      record.errors.add :beds, I18n.t("validations.sales.property_information.beds.bedsits_have_max_one_bedroom")
     end
   end
 
@@ -25,6 +26,6 @@ module Validations::Sales::PropertyValidations
 
     return if record.uprn.match?(/^[0-9]{1,12}$/)
 
-    record.errors.add :uprn, I18n.t("validations.property.uprn.invalid")
+    record.errors.add :uprn, I18n.t("validations.sales.property_information.uprn.invalid")
   end
 end
diff --git a/app/models/validations/shared_validations.rb b/app/models/validations/shared_validations.rb
index 217b2c170..a2ae916c1 100644
--- a/app/models/validations/shared_validations.rb
+++ b/app/models/validations/shared_validations.rb
@@ -131,7 +131,11 @@ module Validations::SharedValidations
     partner_numbers = (2..max_people).select { |n| person_is_partner?(record["relat#{n}"]) }
     if partner_numbers.count > 1
       partner_numbers.each do |n|
-        record.errors.add "relat#{n}", I18n.t("validations.household.relat.one_partner")
+        if record.sales?
+          record.errors.add "relat#{n}", I18n.t("validations.sales.household.relat.one_partner")
+        else
+          record.errors.add "relat#{n}", I18n.t("validations.household.relat.one_partner")
+        end
       end
     end
   end
diff --git a/app/services/bulk_upload/sales/year2024/row_parser.rb b/app/services/bulk_upload/sales/year2024/row_parser.rb
index 360f234b7..7b72eef5c 100644
--- a/app/services/bulk_upload/sales/year2024/row_parser.rb
+++ b/app/services/bulk_upload/sales/year2024/row_parser.rb
@@ -1472,10 +1472,10 @@ private
   def validate_buyer1_economic_status
     if field_35 == 9
       if field_31.present? && field_31.to_i >= 16
-        errors.add(:field_35, I18n.t("validations.household.ecstat.buyer_cannot_be_over_16_and_child", buyer_index: "1"))
-        errors.add(:field_31, I18n.t("validations.household.ecstat.buyer_cannot_be_over_16_and_child", buyer_index: "1"))
+        errors.add(:field_35, I18n.t("validations.sales.household.ecstat.buyer_cannot_be_over_16_and_child", buyer_index: "1"))
+        errors.add(:field_31, I18n.t("validations.sales.household.ecstat.buyer_cannot_be_over_16_and_child", buyer_index: "1"))
       else
-        errors.add(:field_35, I18n.t("validations.household.ecstat.buyer_cannot_be_child", buyer_index: "1"))
+        errors.add(:field_35, I18n.t("validations.sales.household.ecstat1.buyer_cannot_be_child"))
       end
     end
   end
@@ -1485,10 +1485,10 @@ private
 
     if field_42 == 9
       if field_38.present? && field_38.to_i >= 16
-        errors.add(:field_42, I18n.t("validations.household.ecstat.buyer_cannot_be_over_16_and_child", buyer_index: "2"))
-        errors.add(:field_38, I18n.t("validations.household.ecstat.buyer_cannot_be_over_16_and_child", buyer_index: "2"))
+        errors.add(:field_42, I18n.t("validations.sales.household.ecstat.buyer_cannot_be_over_16_and_child", buyer_index: "2"))
+        errors.add(:field_38, I18n.t("validations.sales.household.ecstat.buyer_cannot_be_over_16_and_child", buyer_index: "2"))
       else
-        errors.add(:field_42, I18n.t("validations.household.ecstat.buyer_cannot_be_child", buyer_index: "2"))
+        errors.add(:field_42, I18n.t("validations.sales.household.ecstat2.buyer_cannot_be_child"))
       end
     end
   end
diff --git a/app/services/collection_resources_service.rb b/app/services/collection_resources_service.rb
index 81ab08254..82247f7a0 100644
--- a/app/services/collection_resources_service.rb
+++ b/app/services/collection_resources_service.rb
@@ -24,6 +24,7 @@ class CollectionResourcesService
   end
 
   def upload_collection_resource(filename, file)
-    @storage_service.write_file(filename, file)
+    content_type = MiniMime.lookup_by_filename(filename)&.content_type
+    @storage_service.write_file(filename, file, content_type:)
   end
 end
diff --git a/app/services/mandatory_collection_resources_service.rb b/app/services/mandatory_collection_resources_service.rb
index 8b34153e9..397e4b5d0 100644
--- a/app/services/mandatory_collection_resources_service.rb
+++ b/app/services/mandatory_collection_resources_service.rb
@@ -27,6 +27,7 @@ class MandatoryCollectionResourcesService
       year:,
       log_type:,
       download_filename: download_filename(resource_type, year, log_type),
+      mandatory: true,
     )
   end
 
diff --git a/app/services/storage/local_disk_service.rb b/app/services/storage/local_disk_service.rb
index bb5825340..ad3cc9608 100644
--- a/app/services/storage/local_disk_service.rb
+++ b/app/services/storage/local_disk_service.rb
@@ -19,7 +19,7 @@ module Storage
       File.open(path, "r")
     end
 
-    def write_file(filename, data)
+    def write_file(filename, data, _content_type: nil)
       path = Rails.root.join("tmp/storage", filename)
 
       FileUtils.mkdir_p(path.dirname)
diff --git a/app/services/storage/s3_service.rb b/app/services/storage/s3_service.rb
index 88199c0a0..2e8daa719 100644
--- a/app/services/storage/s3_service.rb
+++ b/app/services/storage/s3_service.rb
@@ -36,12 +36,21 @@ module Storage
              .body.read
     end
 
-    def write_file(file_name, data)
-      @client.put_object(
-        body: data,
-        bucket: @configuration.bucket_name,
-        key: file_name,
-      )
+    def write_file(file_name, data, content_type: nil)
+      if content_type.nil?
+        @client.put_object(
+          body: data,
+          bucket: @configuration.bucket_name,
+          key: file_name,
+        )
+      else
+        @client.put_object(
+          body: data,
+          bucket: @configuration.bucket_name,
+          key: file_name,
+          content_type:,
+        )
+      end
     end
 
     def get_file_metadata(file_name)
diff --git a/app/views/collection_resources/_collection_resource_summary_list.erb b/app/views/collection_resources/_collection_resource_summary_list.erb
index 8ef588fd5..0e630f0aa 100644
--- a/app/views/collection_resources/_collection_resource_summary_list.erb
+++ b/app/views/collection_resources/_collection_resource_summary_list.erb
@@ -23,9 +23,26 @@
           <% end %>
         <% end %>
       <% end %>
+      <% additional_resources&.each do |resource| %>
+        <% summary_list.with_row do |row| %>
+          <% row.with_key { resource.short_display_name } %>
+          <% row.with_value do %>
+            <%= render DocumentListComponent.new(items: document_list_edit_component_items([resource]), label: "") %>
+          <% end %>
+          <% row.with_action(
+            text: "Change",
+            href: collection_resource_edit_path(resource),
+          ) %>
+          <% row.with_action(
+            text: "Delete",
+            href: "/",
+            classes: "app-!-colour-red"
+          ) %>
+        <% end %>
+      <% end %>
     <% end %>
     <div class="govuk-!-margin-bottom-6">
-      <%= govuk_link_to "Add new #{mandatory_resources.first.log_type} #{text_year_range_format(mandatory_resources.first.year)} resource", href: "/" %>
+      <%= govuk_link_to "Add new #{mandatory_resources.first.log_type} #{text_year_range_format(mandatory_resources.first.year)} resource", href: new_collection_resource_path(year: mandatory_resources.first.year, log_type: mandatory_resources.first.log_type) %>
     </div>
     <hr class="govuk-section-break govuk-section-break--visible govuk-section-break--m">
   </div>
diff --git a/app/views/collection_resources/edit.html.erb b/app/views/collection_resources/edit.html.erb
index e5b2a6d33..6100256c8 100644
--- a/app/views/collection_resources/edit.html.erb
+++ b/app/views/collection_resources/edit.html.erb
@@ -5,7 +5,7 @@
 <div class="govuk-grid-row">
   <div class="govuk-grid-column-two-thirds">
     <% resource_exists = file_exists_on_s3?(@collection_resource.download_filename) %>
-    <%= form_with model: @collection_resource, url: update_mandatory_collection_resource_path, method: :patch do |f| %>
+    <%= form_with model: @collection_resource, url: @collection_resource.mandatory ? update_mandatory_collection_resource_path : collection_resource_update_path(@collection_resource), method: :patch do |f| %>
       <%= f.hidden_field :year %>
       <%= f.hidden_field :log_type %>
       <%= f.hidden_field :resource_type %>
@@ -13,7 +13,7 @@
       <%= f.govuk_error_summary %>
 
       <span class="govuk-caption-l"><%= "#{@collection_resource.log_type.humanize} #{text_year_range_format(@collection_resource.year)}" %></span>
-      <h1 class="govuk-heading-l"><%= resource_exists ? "Change" : "Upload" %> the <%= @collection_resource.resource_type.humanize.downcase %></h1>
+      <h1 class="govuk-heading-l"><%= resource_exists ? "Change" : "Upload" %> the <%= @collection_resource.short_display_name.downcase %></h1>
 
       <p class="govuk-body">
         This file will be available for all users to download.
@@ -21,9 +21,22 @@
 
       <%= f.govuk_file_field :file,
         label: { text: "Upload file", size: "m" } %>
+      <% if resource_exists %>
+        <p class="govuk-body">Current file: <%= govuk_link_to @collection_resource.download_filename, href: @collection_resource.download_path %></p>
+      <% end %>
 
-      <%= f.govuk_submit resource_exists ? "Save changes" : "Upload" %>
-      <%= govuk_button_link_to "Cancel", collection_resources_path, secondary: true %>
+      <% unless @collection_resource.mandatory %>
+        <%= f.govuk_text_field :short_display_name,
+                  label: { text: "Resource type", size: "m" },
+                  hint: { text: safe_join(["This will be used in the download link on the homepage. Do not include the log type or collection year.",
+                                           content_tag(:br),
+                                           "For example, if you enter “bulk upload change log”, the download link will say “Download the #{@collection_resource.log_type} bulk upload change log (#{text_year_range_format(@collection_resource.year)})”."]) } %>
+                                          <% end %>
+
+      <div class="govuk-button-group">
+        <%= f.govuk_submit resource_exists ? "Save changes" : "Upload" %>
+        <%= govuk_button_link_to "Cancel", collection_resources_path, secondary: true %>
+      </div>
     <% end %>
   </div>
 </div>
diff --git a/app/views/collection_resources/index.html.erb b/app/views/collection_resources/index.html.erb
index f6785eb46..207a63991 100644
--- a/app/views/collection_resources/index.html.erb
+++ b/app/views/collection_resources/index.html.erb
@@ -18,12 +18,12 @@
   <h2 class="govuk-heading-m">
     Lettings <%= text_year_range_format(year) %>
   </h2>
-  <%= render partial: "collection_resource_summary_list", locals: { mandatory_resources: } %>
+  <%= render partial: "collection_resource_summary_list", locals: { mandatory_resources:, additional_resources: @additional_lettings_collection_resources_per_year[year] } %>
 <% end %>
 
 <% @mandatory_sales_collection_resources_per_year.each do |year, mandatory_resources| %>
   <h2 class="govuk-heading-m">
     Sales <%= text_year_range_format(year) %>
   </h2>
-  <%= render partial: "collection_resource_summary_list", locals: { mandatory_resources: } %>
+  <%= render partial: "collection_resource_summary_list", locals: { mandatory_resources:, additional_resources: @additional_sales_collection_resources_per_year[year] } %>
 <% end %>
diff --git a/app/views/collection_resources/new.html.erb b/app/views/collection_resources/new.html.erb
new file mode 100644
index 000000000..f66c56b94
--- /dev/null
+++ b/app/views/collection_resources/new.html.erb
@@ -0,0 +1,36 @@
+<% content_for :before_content do %>
+  <%= govuk_back_link href: collection_resources_path %>
+<% end %>
+
+<div class="govuk-grid-row">
+  <div class="govuk-grid-column-two-thirds">
+    <%= form_with model: @collection_resource, url: collection_resources_path, method: :post do |f| %>
+      <%= f.hidden_field :year %>
+      <%= f.hidden_field :log_type %>
+      <%= f.hidden_field :mandatory, value: false %>
+
+      <%= f.govuk_error_summary %>
+
+      <span class="govuk-caption-l"><%= "#{@collection_resource.log_type.humanize} #{text_year_range_format(@collection_resource.year)}" %></span>
+      <h1 class="govuk-heading-l">Add a new collection resource</h1>
+
+      <p class="govuk-body">
+        This file will be available for all users to download.
+      </p>
+
+      <%= f.govuk_file_field :file,
+        label: { text: "Upload file", size: "m" } %>
+
+      <%= f.govuk_text_field :short_display_name,
+                      label: { text: "Resource type", size: "m" },
+                      hint: { text: safe_join(["This will be used in the download link on the homepage. Do not include the log type or collection year.",
+                                               content_tag(:br),
+                                               "For example, if you enter “bulk upload change log”, the download link will say “Download the #{@collection_resource.log_type} bulk upload change log (#{text_year_range_format(@collection_resource.year)})”."]) } %>
+
+      <div class="govuk-button-group">
+        <%= f.govuk_submit "Add resource" %>
+        <%= govuk_button_link_to "Cancel", collection_resources_path, secondary: true %>
+      </div>
+    <% end %>
+  </div>
+</div>
diff --git a/app/views/layouts/_collection_resources.html.erb b/app/views/layouts/_collection_resources.html.erb
index 935f1806c..07648e5c0 100644
--- a/app/views/layouts/_collection_resources.html.erb
+++ b/app/views/layouts/_collection_resources.html.erb
@@ -12,12 +12,12 @@
   <%= govuk_tabs(title: "Collection resources", classes: %w[app-tab__small-headers]) do |c| %>
     <% @mandatory_lettings_collection_resources_per_year.each do |year, resources| %>
       <% c.with_tab(label: "Lettings #{year_range_format(year)}") do %>
-          <%= render DocumentListComponent.new(items: document_list_component_items(resources), label: "Lettings #{text_year_range_format(year)}") %>
+          <%= render DocumentListComponent.new(items: document_list_component_items(resources.concat(@additional_lettings_collection_resources_per_year[year] || [])), label: "Lettings #{text_year_range_format(year)}") %>
       <% end %>
     <% end %>
     <% @mandatory_sales_collection_resources_per_year.each do |year, resources| %>
       <% c.with_tab(label: "Sales #{year_range_format(year)}") do %>
-          <%= render DocumentListComponent.new(items: document_list_component_items(resources), label: "Sales #{text_year_range_format(year)}") %>
+          <%= render DocumentListComponent.new(items: document_list_component_items(resources.concat(@additional_sales_collection_resources_per_year[year] || [])), label: "Sales #{text_year_range_format(year)}") %>
       <% end %>
     <% end %>
   <% end %>
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 27c5e0673..faced2c11 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -122,7 +122,7 @@ en:
             file:
               error_uploading: There was an error uploading this file.
               blank: Select which file to upload.
-              above_100_mb: The file is above 100MB.
+              above_100_mb: File must be 100MB or less.
               must_be_pdf: The paper form must be a PDF.
               must_be_xlsx: The %{resource} must be a Microsoft Excel file.
 
@@ -212,9 +212,12 @@ en:
             file:
               error_uploading: There was an error uploading this file.
               blank: Select which file to upload.
-              above_100_mb: The file is above 100MB.
+              above_100_mb: File must be 100MB or less.
               must_be_pdf: The paper form must be a PDF.
               must_be_xlsx: The %{resource} must be a Microsoft Excel file.
+            short_display_name:
+              blank: "You must answer resource type."
+
   notification:
     logs_deleted:
       one: "%{count} log has been deleted."
@@ -382,12 +385,6 @@ en:
         one_bedroom_bedsit: "A bedsit can only have one bedroom."
         one_seven_bedroom_shared: "A shared house must have 1 to 7 bedrooms."
         one_three_bedroom_single_tenant_shared: "A shared house with fewer than two tenants must have 1 to 3 bedrooms."
-      beds:
-        bedsits_have_max_one_bedroom: "Number of bedrooms must be 1 if the property is a bedsit."
-      proptype:
-        bedsits_have_max_one_bedroom: "Answer cannot be 'Bedsit' if the property has 2 or more bedrooms."
-      postcode:
-        must_match_previous: "%{buyer_possessive} last accommodation and discounted ownership postcodes must match."
 
     financial:
       tshortfall:
@@ -501,11 +498,8 @@ en:
         retired_female: "A female tenant who is retired must be 60 or over."
         retired_over_70: "Answer cannot be over 70 as person %{person_num} has economic status that is not ‘retired’."
         child_under_16_relat_lettings: "Answer cannot be under 16 as person %{person_num}'s relationship to the lead tenant is ‘partner’."
-        child_under_16_relat_sales: "Answer cannot be under 16 as person %{person_num}'s relationship to buyer 1 is ‘partner’."
         child_under_16_ecstat: "Answer cannot be under 16 as person %{person_num}’s working situation is not ‘child under 16’, ‘other’ or ‘prefers not to say’."
         child_over_16: "Answer cannot be over 16 as person’s %{person_num} working situation is ‘child under 16‘."
-        child_over_20: "Answer cannot be 20 or over as the relationship is ‘child’."
-        child_12_years_younger: "A child must be at least 12 years younger than their parent."
         not_student_16_19: "Answer cannot be between 16 and 19 as person %{person_num} is a child of the lead tenant but is not a full-time student."
         student_16_19:
           cannot_be_16_19:
@@ -528,12 +522,8 @@ en:
         retired_female: "Answer cannot be ‘retired’ as the female tenant is under 60."
         not_child_16_19:
           cannot_be_student: "Person cannot be a student if they are aged 16-19 but are not a child."
-        buyer_cannot_be_child: "Buyer %{buyer_index} cannot have a working situation of child under 16."
-        buyer_cannot_be_over_16_and_child: "Buyer %{buyer_index}'s age cannot be 16 or over if their working situation is child under 16."
       relat:
-        child_under_16_sales: "Answer cannot be ‘partner’ as you told us person %{person_num}'s age is under 16."
         child_under_16_lettings: "Answer cannot be ‘partner’ as you told us person %{person_num}'s age is under 16."
-        child_over_20: "Answer cannot be ‘child’ if the person's age is 20 or over."
         one_partner: "Number of partners cannot be greater than 1."
         not_student_16_19: "Answer cannot be ‘child’ as you told us the person %{person_num} is between 16 and 19 and is not a full-time student."
         student_16_19:
@@ -556,7 +546,6 @@ en:
         internal_transfer: "Answer cannot be %{prevten} as this tenancy is an internal transfer."
         la_general_needs:
           internal_transfer: "Answer cannot be a fixed-term or lifetime local authority general needs tenancy as it’s an internal transfer and a private registered provider is on the tenancy agreement."
-        invalid_for_discounted_sale: "Buyer 1’s previous tenure should be “local authority tenant” or “private registered provider or housing association tenant” for discounted sales."
       referral:
         secure_tenancy: "Answer must be internal transfer as this is a secure tenancy."
         rsnvac_non_temp: "Answer cannot be this source of referral as this is a re-let to tenant who occupied the same property as temporary accommodation."
@@ -596,9 +585,6 @@ en:
         no_choices: "You cannot answer this question as you told us nobody in the household has a physical or mental health condition (or other illness) expected to last 12 months or more."
       postcode:
         discounted_ownership: "Last settled accommodation and discounted ownership property postcodes must match."
-      buylivein:
-        buyers_will_live_in_property_values_inconsistent_setup: "You have already told us that both buyer 1 and buyer 2 will not live in the property."
-        buyers_will_live_in_property_values_inconsistent: "You have already told us that the buyers will live in the property. Either buyer 1 or buyer 2 must live in the property."
       nationality: "Select a valid nationality."
 
     tenancy:
@@ -703,13 +689,6 @@ en:
         message: "Net income is lower than expected based on the household’s working situation. Are you sure this is correct?"
       in_soft_max_range:
         message: "Net income is higher than expected based on the household’s working situation. Are you sure this is correct?"
-    income:
-      under_soft_min_for_economic_status:
-        title_text: "You told us income was %{income}."
-        hint_text: "This is less than we would expect for someone in this working situation."
-      over_soft_max_for_la_buyer_1: "You told us the income of buyer 1 is %{income}. This seems high.  Are you sure this is correct?"
-      over_soft_max_for_la_buyer_2: "You told us the income of buyer 2 is %{income}. This seems high.  Are you sure this is correct?"
-      over_soft_max_for_la_combined: "You told us the combined income of this household is %{combined_income}. This seems high.  Are you sure this is correct?"
     rent:
       outside_range_title: "You told us the rent is %{brent}."
       informative_text: "This is %{higher_or_lower} than we would expect."
@@ -772,24 +751,11 @@ Make sure these answers are correct."
     percentage_discount_value:
       title_text: "You told us that the percentage discount is %{discount}."
       hint_text: "This is higher than we would expect."
-    savings:
-      title_text:
-        one: "You told us the buyer’s savings were %{savings}."
-        two: "You told us the buyers’ savings were %{savings}."
-      hint_text: "This is higher than we would expect."
-    deposit:
-      title_text:
-        one: "You told us the buyer’s deposit was %{deposit} and their savings were %{savings}."
-        two: "You told us the buyers’ deposit was %{deposit} and their savings were %{savings}."
-      hint_text: "The deposit amount is higher than we would expect for the amount of savings they have."
     grant:
       title_text: "You told us that the grant amount is %{grant}."
       hint_text: "Loans, grants and subsidies are usually between £9,000 and £16,000."
     wheelchair:
       title_text: "You told us that someone in the household uses a wheelchair."
-    mortgage:
-      title_text: "You told us that the mortgage amount is %{mortgage}."
-      hint_text: "This is more than 5 times the income, which is higher than we would expect."
     referral:
       title_text: "Are you sure?"
       hint_text: "This is a general needs log, and this referral type is for supported housing."
@@ -859,9 +825,6 @@ Make sure these answers are correct."
     soctenant:
       one: "Was the buyer a private registered provider, housing association or local authority tenant immediately before this sale?"
       other: "Were any of the buyers private registered providers, housing association or local authority tenants immediately before this sale?"
-    prevown:
-      one: "Has the buyer previously owned a property?"
-      other: "Have any of the buyers previously owned a property?"
     stairowned:
       one: "What percentage of the property does the buyer now own in total?"
       other: "What percentage of the property do the buyers now own in total?"
@@ -884,9 +847,6 @@ Make sure these answers are correct."
     soctenant:
       one: "Buyer was a registered provider, housing association or local authority tenant immediately before this sale?"
       other: "Any buyers were registered providers, housing association or local authority tenants immediately before this sale?"
-    prevown:
-      one: "Buyer previously owned a property."
-      other: "Buyers previously owned a property."
     stairowned:
       one: "Percentage the buyer now owns in total."
       other: "Percentage the buyers now own in total."
diff --git a/config/locales/forms/2023/sales/income_benefits_and_savings.en.yml b/config/locales/forms/2023/sales/income_benefits_and_savings.en.yml
new file mode 100644
index 000000000..49262d7a1
--- /dev/null
+++ b/config/locales/forms/2023/sales/income_benefits_and_savings.en.yml
@@ -0,0 +1,90 @@
+en:
+  forms:
+    2023:
+      sales:
+        income_benefits_and_savings:
+          buyer_1_income:
+            page_header: ""
+            income1nk:
+              check_answer_label: "Buyer 1’s gross annual income known?"
+              hint_text: ""
+              question_text: "Do you know buyer 1’s annual income?"
+            income1:
+              check_answer_label: "Buyer 1’s gross annual income"
+              hint_text: "Provide the gross annual income (i.e. salary before tax) plus the annual amount of benefits, Universal Credit or pensions, and income from investments."
+              question_text: "Buyer 1’s gross annual income"
+        
+          inc1mort:
+            page_header: ""
+            check_answer_label: "Buyer 1’s income used for mortgage application"
+            hint_text: ""
+            question_text: "Was buyer 1’s income used for a mortgage application?"
+
+          buyer_2_income:
+            page_header: ""
+            income2nk:
+              check_answer_label: "Buyer 2’s gross annual income known?"
+              hint_text: ""
+              question_text: "Do you know buyer 2’s annual income?"
+            income2:
+              check_answer_label: "Buyer 2’s gross annual income"
+              hint_text: "Provide the gross annual income (i.e. salary before tax) plus the annual amount of benefits, Universal Credit or pensions, and income from investments."
+              question_text: "Buyer 2’s gross annual income"
+
+          inc2mort:
+            page_header: ""
+            check_answer_label:  "Buyer 2’s income used for mortgage application"
+            hint_text: ""
+            question_text: "Was buyer 2’s income used for a mortgage application?"
+
+          housing_benefits:
+            joint_purchase:
+              page_header: ""
+              check_answer_label: "Housing-related benefits buyers received before buying this property"
+              hint_text: ""
+              question_text:  "Were the buyers receiving any of these housing-related benefits immediately before buying this property?"
+            not_joint_purchase:
+              page_header: ""
+              check_answer_label: "Housing-related benefits buyer received before buying this property"
+              hint_text: ""
+              question_text:  "Was the buyer receiving any of these housing-related benefits immediately before buying this property?"
+            
+          savings:
+            joint_purchase:
+              page_header: ""
+              savingsnk:
+                check_answer_label:  "Buyers’ total savings known?"
+                hint_text: ""
+                question_text: "Do you know how much the 'buyers' had in savings before they paid any deposit for the property?"
+              savings:
+                check_answer_label: "Buyers’ total savings before any deposit paid"
+                hint_text: "Include any savings, investments, ISAs, premium bonds, shares, or money held in a bank or building society account."
+                question_text: "Enter their total savings to the nearest £10"
+            not_joint_purchase:
+              page_header: ""
+              savingsnk:
+                check_answer_label:  "Buyer’s total savings known?"
+                hint_text: ""
+                question_text: "Do you know how much the buyer had in savings before they paid any deposit for the property?"
+              savings:
+                check_answer_label: "Buyer’s total savings before any deposit paid"
+                hint_text: "Include any savings, investments, ISAs, premium bonds, shares, or money held in a bank or building society account."
+                question_text: "Enter their total savings to the nearest £10"
+
+          prevown:
+            joint_purchase:
+              page_header: ""
+              check_answer_label: "Buyers previously owned a property."
+              hint_text: ""
+              question_text: "Have any of the buyers previously owned a property?"
+            not_joint_purchase:
+              page_header: ""
+              check_answer_label: "Buyer previously owned a property."
+              hint_text: ""
+              question_text: "Has the buyer previously owned a property?"
+
+          prevshared:
+            page_header: ""
+            check_answer_label: "Previous property shared ownership?"
+            hint_text: "For any buyer"
+            question_text: "Was the previous property under shared ownership?"
\ No newline at end of file
diff --git a/config/locales/forms/2023/sales/soft_validations.en.yml b/config/locales/forms/2023/sales/soft_validations.en.yml
new file mode 100644
index 000000000..de5138208
--- /dev/null
+++ b/config/locales/forms/2023/sales/soft_validations.en.yml
@@ -0,0 +1,60 @@
+en:
+  forms:
+    2023:
+      sales:
+        soft_validations:
+          income1_value_check:
+            page_header: ""
+            check_answer_label: "Buyer 1 income confirmation"
+            hint_text: ""
+            question_text: "Are you sure this is correct?"
+            min:
+              title_text: "You told us income was %{income}."
+              informative_text: "This is less than we would expect for someone in this working situation."
+            max:
+              title_text: "You told us the income of buyer 1 is %{income}. This seems high. Are you sure this is correct?"
+          income2_value_check:
+            page_header: ""
+            check_answer_label: "Buyer 2 income confirmation"
+            hint_text: ""
+            question_text: "Are you sure this is correct?"
+            min:
+              title_text: "You told us income was %{income}."
+              informative_text: "This is less than we would expect for someone in this working situation."
+            max:
+              title_text: "You told us the income of buyer 2 is %{income}. This seems high. Are you sure this is correct?"
+          combined_income_value_check:
+            page_header: ""
+            check_answer_label: "Combined income confirmation"
+            hint_text: ""
+            question_text: "Are you sure this is correct?"
+            title_text: "You told us the combined income of this household is %{combined_income}. This seems high.  Are you sure this is correct?"
+          mortgage_value_check:
+            page_header: ""
+            check_answer_label: "Mortgage confirmation"
+            hint_text: ""
+            question_text: "Are you sure that the mortgage is more than 5 times the income used for the mortgage application?"
+            title_text: "You told us that the mortgage amount is %{mortgage}."
+            informative_text: "This is more than 5 times the income, which is higher than we would expect."
+          savings_value_check:
+            page_header: ""
+            check_answer_label: "Savings confirmation"
+            hint_text: ""
+            question_text: "Are you sure the savings are higher than £100,000?"
+            joint_purchase:
+              title_text: You told us the buyers’ savings were %{savings}."
+              informative_text: "This is higher than we would expect."
+            not_joint_purchase:
+              title_text: "You told us the buyer’s savings were %{savings}."
+              informative_text: "This is higher than we would expect."
+          deposit_value_check::
+            page_header: ""
+            check_answer_label: "Deposit confirmation"
+            hint_text: ""
+            question_text: "Are you sure that the deposit is this much higher than the buyer's savings?"
+            joint_purchase:
+              title_text: "You told us the buyers’ deposit was %{deposit} and their savings were %{savings}."
+              informative_text: "The deposit amount is higher than we would expect for the amount of savings they have."
+            not_joint_purchase:
+              title_text: "You told us the buyer’s deposit was %{deposit} and their savings were %{savings}."
+              informative_text: "The deposit amount is higher than we would expect for the amount of savings they have."
diff --git a/config/locales/forms/2024/sales/income_benefits_and_savings.en.yml b/config/locales/forms/2024/sales/income_benefits_and_savings.en.yml
new file mode 100644
index 000000000..0654c9e1f
--- /dev/null
+++ b/config/locales/forms/2024/sales/income_benefits_and_savings.en.yml
@@ -0,0 +1,90 @@
+en:
+  forms:
+    2024:
+      sales:
+        income_benefits_and_savings:
+          buyer_1_income:
+            page_header: ""
+            income1nk:
+              check_answer_label: "Buyer 1’s gross annual income known?"
+              hint_text: ""
+              question_text: "Do you know buyer 1’s annual income?"
+            income1:
+              check_answer_label: "Buyer 1’s gross annual income"
+              hint_text: "Provide the gross annual income (i.e. salary before tax) plus the annual amount of benefits, Universal Credit or pensions, and income from investments."
+              question_text: "Buyer 1’s gross annual income"
+        
+          inc1mort:
+            page_header: ""
+            check_answer_label: "Buyer 1’s income used for mortgage application"
+            hint_text: ""
+            question_text: "Was buyer 1’s income used for a mortgage application?"
+
+          buyer_2_income:
+            page_header: ""
+            income2nk:
+              check_answer_label: "Buyer 2’s gross annual income known?"
+              hint_text: ""
+              question_text: "Do you know buyer 2’s annual income?"
+            income2:
+              check_answer_label: "Buyer 2’s gross annual income"
+              hint_text: "Provide the gross annual income (i.e. salary before tax) plus the annual amount of benefits, Universal Credit or pensions, and income from investments."
+              question_text: "Buyer 2’s gross annual income"
+
+          inc2mort:
+            page_header: ""
+            check_answer_label:  "Buyer 2’s income used for mortgage application"
+            hint_text: ""
+            question_text: "Was buyer 2’s income used for a mortgage application?"
+
+          housing_benefits:
+            joint_purchase:
+              page_header: ""
+              check_answer_label: "Housing-related benefits buyers received before buying this property"
+              hint_text: ""
+              question_text:  "Were the buyers receiving any of these housing-related benefits immediately before buying this property?"
+            not_joint_purchase:
+              page_header: ""
+              check_answer_label: "Housing-related benefits buyer received before buying this property"
+              hint_text: ""
+              question_text:  "Was the buyer receiving any of these housing-related benefits immediately before buying this property?"
+            
+          savings:
+            joint_purchase:
+              page_header: ""
+              savingsnk:
+                check_answer_label:  "Buyers’ total savings known?"
+                hint_text: ""
+                question_text: "Do you know how much the 'buyers' had in savings before they paid any deposit for the property?"
+              savings:
+                check_answer_label: "Buyers’ total savings before any deposit paid"
+                hint_text: "Include any savings, investments, ISAs, premium bonds, shares, or money held in a bank or building society account."
+                question_text: "Enter their total savings to the nearest £10"
+            not_joint_purchase:
+              page_header: ""
+              savingsnk:
+                check_answer_label:  "Buyer’s total savings known?"
+                hint_text: ""
+                question_text: "Do you know how much the buyer had in savings before they paid any deposit for the property?"
+              savings:
+                check_answer_label: "Buyer’s total savings before any deposit paid"
+                hint_text: "Include any savings, investments, ISAs, premium bonds, shares, or money held in a bank or building society account."
+                question_text: "Enter their total savings to the nearest £10"
+
+          prevown:
+            joint_purchase:
+              page_header: ""
+              check_answer_label: "Buyers previously owned a property."
+              hint_text: ""
+              question_text: "Have any of the buyers previously owned a property?"
+            not_joint_purchase:
+              page_header: ""
+              check_answer_label: "Buyer previously owned a property."
+              hint_text: ""
+              question_text: "Has the buyer previously owned a property?"
+
+          prevshared:
+            page_header: ""
+            check_answer_label: "Previous property shared ownership?"
+            hint_text: "For any buyer"
+            question_text: "Was the previous property under shared ownership?"
\ No newline at end of file
diff --git a/config/locales/forms/2024/sales/soft_validations.en.yml b/config/locales/forms/2024/sales/soft_validations.en.yml
new file mode 100644
index 000000000..853d21ad2
--- /dev/null
+++ b/config/locales/forms/2024/sales/soft_validations.en.yml
@@ -0,0 +1,60 @@
+en:
+  forms:
+    2024:
+      sales:
+        soft_validations:
+          income1_value_check:
+            page_header: ""
+            check_answer_label: "Buyer 1 income confirmation"
+            hint_text: ""
+            question_text: "Are you sure this is correct?"
+            min:
+              title_text: "You told us income was %{income}."
+              informative_text: "This is less than we would expect for someone in this working situation."
+            max:
+              title_text: "You told us the income of buyer 1 is %{income}. This seems high. Are you sure this is correct?"
+          income2_value_check:
+            page_header: ""
+            check_answer_label: "Buyer 2 income confirmation"
+            hint_text: ""
+            question_text: "Are you sure this is correct?"
+            min:
+              title_text: "You told us income was %{income}."
+              informative_text: "This is less than we would expect for someone in this working situation."
+            max:
+              title_text: "You told us the income of buyer 2 is %{income}. This seems high. Are you sure this is correct?"
+          combined_income_value_check:
+            page_header: ""
+            check_answer_label: "Combined income confirmation"
+            hint_text: ""
+            question_text: "Are you sure this is correct?"
+            title_text: "You told us the combined income of this household is %{combined_income}. This seems high.  Are you sure this is correct?"
+          mortgage_value_check:
+            page_header: ""
+            check_answer_label: "Mortgage confirmation"
+            hint_text: ""
+            question_text: "Are you sure that the mortgage is more than 5 times the income used for the mortgage application?"
+            title_text: "You told us that the mortgage amount is %{mortgage}."
+            informative_text: "This is more than 5 times the income, which is higher than we would expect."
+          savings_value_check:
+            page_header: ""
+            check_answer_label: "Savings confirmation"
+            hint_text: ""
+            question_text: "Are you sure the savings are higher than £100,000?"
+            joint_purchase:
+              title_text: You told us the buyers’ savings were %{savings}."
+              informative_text: "This is higher than we would expect."
+            not_joint_purchase:
+              title_text: "You told us the buyer’s savings were %{savings}."
+              informative_text: "This is higher than we would expect."
+          deposit_value_check:
+            page_header: ""
+            check_answer_label: "Deposit confirmation"
+            hint_text: ""
+            question_text: "Are you sure that the deposit is this much higher than the buyer's savings?"
+            joint_purchase:
+              title_text: "You told us the buyers’ deposit was %{deposit} and their savings were %{savings}."
+              informative_text: "The deposit amount is higher than we would expect for the amount of savings they have."
+            not_joint_purchase:
+              title_text: "You told us the buyer’s deposit was %{deposit} and their savings were %{savings}."
+              informative_text: "The deposit amount is higher than we would expect for the amount of savings they have."
diff --git a/config/locales/validations/sales/household.en.yml b/config/locales/validations/sales/household.en.yml
new file mode 100644
index 000000000..c1f90971c
--- /dev/null
+++ b/config/locales/validations/sales/household.en.yml
@@ -0,0 +1,47 @@
+en:
+  validations:
+    sales:
+      household:
+        buylivein:
+          buyers_will_live_in_property_values_inconsistent: "You have already told us that both buyer 1 and buyer 2 will not live in the property."
+        buy1livein:
+          buyers_will_live_in_property_values_inconsistent: "You have already told us that the buyers will live in the property. Either buyer 1 or buyer 2 must live in the property."
+        buy2livein:
+          buyers_will_live_in_property_values_inconsistent: "You have already told us that the buyers will live in the property. Either buyer 1 or buyer 2 must live in the property."
+        ownershipsch:
+          prevten_invalid_for_discounted_sale: "Buyer 1’s previous tenure should be “local authority tenant” or “private registered provider or housing association tenant” for discounted sales."
+        prevten:
+          prevten_invalid_for_discounted_sale: "Buyer 1’s previous tenure should be “local authority tenant” or “private registered provider or housing association tenant” for discounted sales."
+        age1:
+          child_12_years_younger: "A child must be at least 12 years younger than their parent."
+        ecstat1:
+          buyer_cannot_be_child: "Buyer 1 cannot have a working situation of child under 16."
+        ecstat2:
+          buyer_cannot_be_child: "Buyer 2 cannot have a working situation of child under 16."
+        age:
+          child_12_years_younger: "A child must be at least 12 years younger than their parent."
+          child_under_16: "Answer cannot be under 16 as person %{person_num}'s relationship to buyer 1 is ‘partner’."
+          child_under_16_ecstat: "Answer cannot be under 16 as person %{person_num}’s working situation is not ‘child under 16’, ‘other’ or ‘prefers not to say’."
+          child_over_16: "Answer cannot be over 16 as person’s %{person_num} working situation is ‘child under 16‘."
+          child_over_20: "Answer cannot be 20 or over as the relationship is ‘child’."
+          student_16_19:
+            cannot_be_16_19:
+              child_not_student: "Person cannot be aged 16-19 if they have relationship ‘child’ but are not a student."
+            must_be_16_19: "Person must be aged 16-19 if they are a student and have relationship ‘child’."
+        relat:
+          one_partner: "Number of partners cannot be greater than 1."
+          child_12_years_younger: "A child must be at least 12 years younger than their parent."
+          child_under_16: "Answer cannot be ‘partner’ as you told us person %{person_num}'s age is under 16."
+          child_over_20: "Answer cannot be ‘child’ if the person's age is 20 or over."
+          student_16_19:
+            cannot_be_child:
+              student_not_16_19: "Answer cannot be ‘child’ if the person is a student but not aged 16-19."
+              16_19_not_student:  "Answer cannot be ‘child’ if the person is aged 16-19 but not a student."
+        ecstat:
+          child_under_16: "Person %{person_num}’s working situation must be ‘child under 16’, ‘other’ or ‘prefers not to say’ as you told us they’re under 16."
+          child_over_16: "Answer cannot be ‘child under 16’ as you told us the person %{person_num} is older than 16."
+          student_16_19:
+            must_be_student: "Person must be a student if they are aged 16-19 and have relationship ‘child’."
+            cannot_be_student:
+              child_not_16_19: "Person cannot be a student if they are not aged 16-19 but have relationship ‘child’."
+          buyer_cannot_be_over_16_and_child: "Buyer %{buyer_index}'s age cannot be 16 or over if their working situation is child under 16."
diff --git a/config/locales/validations/sales/property_information.en.yml b/config/locales/validations/sales/property_information.en.yml
new file mode 100644
index 000000000..e69f90edf
--- /dev/null
+++ b/config/locales/validations/sales/property_information.en.yml
@@ -0,0 +1,27 @@
+en:
+  validations:
+    sales:
+      property_information:
+        postcode_full:
+          postcode_must_match_previous: 
+            joint_purchase: "Buyers’ last accommodation and discounted ownership postcodes must match."
+            not_joint_purchase: "Buyer’s last accommodation and discounted ownership postcodes must match."
+        ppostcode_full:
+          postcode_must_match_previous: 
+            joint_purchase: "Buyers’ last accommodation and discounted ownership postcodes must match."
+            not_joint_purchase: "Buyer’s last accommodation and discounted ownership postcodes must match."
+        ownershipsch:
+          postcode_must_match_previous:
+            joint_purchase: "Buyers’ last accommodation and discounted ownership postcodes must match."
+            not_joint_purchase: "Buyer’s last accommodation and discounted ownership postcodes must match."
+        uprn:
+          postcode_must_match_previous: 
+            joint_purchase: "Buyers’ last accommodation and discounted ownership postcodes must match."
+            not_joint_purchase: "Buyer’s last accommodation and discounted ownership postcodes must match."
+          invalid: "UPRN must be 12 digits or less."
+        beds:
+          bedsits_have_max_one_bedroom: "Number of bedrooms must be 1 if the property is a bedsit."
+        proptype:
+          bedsits_have_max_one_bedroom: "Answer cannot be 'Bedsit' if the property has 2 or more bedrooms."
+        uprn_known:
+          invalid: "You must answer UPRN known?"
diff --git a/config/routes.rb b/config/routes.rb
index db4b2a8a2..cbac4894a 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -42,13 +42,15 @@ Rails.application.routes.draw do
 
   get "collection-resources", to: "collection_resources#index"
   get "/collection-resources/:log_type/:year/:resource_type/download", to: "collection_resources#download_mandatory_collection_resource", as: :download_mandatory_collection_resource
-  get "/collection-resources/:log_type/:year/:resource_type/edit", to: "collection_resources#edit", as: :edit_mandatory_collection_resource
-  patch "/collection-resources", to: "collection_resources#update", as: :update_mandatory_collection_resource
+  get "/collection-resources/:log_type/:year/:resource_type/edit", to: "collection_resources#edit_mandatory_collection_resource", as: :edit_mandatory_collection_resource
+  patch "/collection-resources", to: "collection_resources#update_mandatory_collection_resource", as: :update_mandatory_collection_resource
   get "/collection-resources/:year/release", to: "collection_resources#confirm_mandatory_collection_resources_release", as: :confirm_mandatory_collection_resources_release
   patch "/collection-resources/:year/release", to: "collection_resources#release_mandatory_collection_resources", as: :release_mandatory_collection_resources
 
   resources :collection_resources, path: "/collection-resources" do
-    get "/download", to: "collection_resources#download_additional_collection_resource" # when we get to adding them
+    get "/download", to: "collection_resources#download_additional_collection_resource"
+    get "/edit", to: "collection_resources#edit_additional_collection_resource"
+    patch "/update", to: "collection_resources#update_additional_collection_resource"
   end
 
   get "clear-filters", to: "sessions#clear_filters"
diff --git a/spec/factories/collection_resource.rb b/spec/factories/collection_resource.rb
index c352b70a9..0282e33e3 100644
--- a/spec/factories/collection_resource.rb
+++ b/spec/factories/collection_resource.rb
@@ -6,5 +6,15 @@ FactoryBot.define do
     year { 2024 }
     log_type { "lettings" }
     download_filename { "24_25_lettings_paper_form.pdf" }
+    mandatory { true }
+    trait(:additional) do
+      resource_type { nil }
+      display_name { "lettings additional resource (2024 to 2025)" }
+      short_display_name { "additional resource" }
+      year { 2024 }
+      log_type { "lettings" }
+      download_filename { "additional.pdf" }
+      mandatory { false }
+    end
   end
 end
diff --git a/spec/features/collection_resources_spec.rb b/spec/features/collection_resources_spec.rb
index 643f3537e..ad9a370b6 100644
--- a/spec/features/collection_resources_spec.rb
+++ b/spec/features/collection_resources_spec.rb
@@ -5,6 +5,9 @@ RSpec.describe "Collection resources" do
   let(:collection_resources_service) { instance_double(CollectionResourcesService, file_exists_on_s3?: true) }
 
   before do
+    # rubocop:disable RSpec/AnyInstance
+    allow_any_instance_of(CollectionResourcesHelper).to receive(:editable_collection_resource_years).and_return([2024, 2025])
+    # rubocop:enable RSpec/AnyInstance
     allow(CollectionResourcesService).to receive(:new).and_return(collection_resources_service)
     allow(collection_resources_service).to receive(:upload_collection_resource)
     allow(collection_resources_service).to receive(:get_file_metadata).and_return({ "content_type" => "application/pdf", "content_length" => 1000 })
@@ -165,4 +168,74 @@ RSpec.describe "Collection resources" do
       expect(page).to have_content("There was an error uploading this file.")
     end
   end
+
+  context "when uploading an additional resource" do
+    it "allows valid files" do
+      expect(CollectionResource.count).to eq(0)
+
+      visit(new_collection_resource_path(year: 2025, log_type: "sales"))
+      fill_in("collection_resource[short_display_name]", with: "some file")
+      attach_file "file", file_fixture("pdf_file.pdf")
+
+      click_button("Add resource")
+      expect(collection_resources_service).to have_received(:upload_collection_resource).with("pdf_file.pdf", anything)
+      expect(CollectionResource.count).to eq(1)
+      expect(CollectionResource.first.year).to eq(2025)
+      expect(CollectionResource.first.log_type).to eq("sales")
+      expect(CollectionResource.first.resource_type).to be_nil
+      expect(CollectionResource.first.mandatory).to be_falsey
+      expect(CollectionResource.first.released_to_user).to be_nil
+      expect(CollectionResource.first.display_name).to eq("sales some file (2025 to 2026)")
+      expect(CollectionResource.first.short_display_name).to eq("some file")
+      expect(page).to have_content("The sales 2025 to 2026 some file has been uploaded.")
+    end
+
+    it "validates file is attached" do
+      visit(new_collection_resource_path(year: 2025, log_type: "sales"))
+
+      fill_in("collection_resource[short_display_name]", with: "some file")
+      click_button("Add resource")
+      expect(page).to have_content("Select which file to upload.")
+    end
+
+    it "validates resource type is given" do
+      visit(new_collection_resource_path(year: 2025, log_type: "sales"))
+
+      attach_file "file", file_fixture("pdf_file.pdf")
+      click_button("Add resource")
+      expect(page).to have_content("You must answer resource type.")
+    end
+  end
+
+  context "when updating an additional resource" do
+    let!(:collection_resource) { create(:collection_resource, :additional, year: 2025, log_type: "sales") }
+
+    it "only allows valid files" do
+      expect(CollectionResource.count).to eq(1)
+
+      visit(collection_resource_edit_path(collection_resource))
+      fill_in("collection_resource[short_display_name]", with: "some updated file")
+      attach_file "file", file_fixture("pdf_file.pdf")
+
+      click_button("Save changes")
+      expect(collection_resources_service).to have_received(:upload_collection_resource).with("pdf_file.pdf", anything)
+      expect(CollectionResource.count).to eq(1)
+      expect(CollectionResource.first.year).to eq(2025)
+      expect(CollectionResource.first.log_type).to eq("sales")
+      expect(CollectionResource.first.resource_type).to be_nil
+      expect(CollectionResource.first.mandatory).to be_falsey
+      expect(CollectionResource.first.released_to_user).to be_nil
+      expect(CollectionResource.first.display_name).to eq("sales some updated file (2025 to 2026)")
+      expect(CollectionResource.first.short_display_name).to eq("some updated file")
+      expect(page).to have_content("The sales 2025 to 2026 some updated file has been updated.")
+    end
+
+    it "validates file is attached" do
+      visit(collection_resource_edit_path(collection_resource))
+
+      fill_in("collection_resource[short_display_name]", with: "some file")
+      click_button("Save changes")
+      expect(page).to have_content("Select which file to upload.")
+    end
+  end
 end
diff --git a/spec/helpers/collection_resources_helper_spec.rb b/spec/helpers/collection_resources_helper_spec.rb
index 859d14cd1..9fc77a4c9 100644
--- a/spec/helpers/collection_resources_helper_spec.rb
+++ b/spec/helpers/collection_resources_helper_spec.rb
@@ -94,9 +94,9 @@ RSpec.describe CollectionResourcesHelper do
 
       context "and next year resources were manually released" do
         before do
-          CollectionResource.create!(year: 2025, resource_type: "paper_form", display_name: "lettings log for tenants (2025 to 2026)", download_filename: "file.pdf", mandatory: true, released_to_user: true)
-          CollectionResource.create!(year: 2025, resource_type: "bulk_upload_template", display_name: "bulk upload template (2025 to 2026)", download_filename: "file.xlsx", mandatory: true, released_to_user: true)
-          CollectionResource.create!(year: 2025, resource_type: "bulk_upload_specification", display_name: "sales log for tenants (2025 to 2026)", download_filename: "file.xlsx", mandatory: true, released_to_user: true)
+          create(:collection_resource, year: 2025, resource_type: "paper_form", display_name: "lettings log for tenants (2025 to 2026)", download_filename: "file.pdf", mandatory: true, released_to_user: true)
+          create(:collection_resource, year: 2025, resource_type: "bulk_upload_template", display_name: "bulk upload template (2025 to 2026)", download_filename: "file.xlsx", mandatory: true, released_to_user: true)
+          create(:collection_resource, year: 2025, resource_type: "bulk_upload_specification", display_name: "sales log for tenants (2025 to 2026)", download_filename: "file.xlsx", mandatory: true, released_to_user: true)
         end
 
         it "reutrns current and next years" do
@@ -199,9 +199,9 @@ RSpec.describe CollectionResourcesHelper do
 
       context "and the resources have been manually released" do
         before do
-          CollectionResource.create!(year: 2025, resource_type: "paper_form", display_name: "lettings log for tenants (2025 to 2026)", download_filename: "file.pdf", mandatory: true, released_to_user: true)
-          CollectionResource.create!(year: 2025, resource_type: "bulk_upload_template", display_name: "bulk upload template (2025 to 2026)", download_filename: "file.xlsx", mandatory: true, released_to_user: true)
-          CollectionResource.create!(year: 2025, resource_type: "bulk_upload_specification", display_name: "sales log for tenants (2025 to 2026)", download_filename: "file.xlsx", mandatory: true, released_to_user: true)
+          create(:collection_resource, year: 2025, resource_type: "paper_form", display_name: "lettings log for tenants (2025 to 2026)", download_filename: "file.pdf", mandatory: true, released_to_user: true)
+          create(:collection_resource, year: 2025, resource_type: "bulk_upload_template", display_name: "bulk upload template (2025 to 2026)", download_filename: "file.xlsx", mandatory: true, released_to_user: true)
+          create(:collection_resource, year: 2025, resource_type: "bulk_upload_specification", display_name: "sales log for tenants (2025 to 2026)", download_filename: "file.xlsx", mandatory: true, released_to_user: true)
         end
 
         it "returns false" do
diff --git a/spec/models/form/sales/pages/buyer1_income_max_value_check_spec.rb b/spec/models/form/sales/pages/buyer1_income_max_value_check_spec.rb
index 48e921468..fa5cf1e7c 100644
--- a/spec/models/form/sales/pages/buyer1_income_max_value_check_spec.rb
+++ b/spec/models/form/sales/pages/buyer1_income_max_value_check_spec.rb
@@ -5,7 +5,8 @@ RSpec.describe Form::Sales::Pages::Buyer1IncomeMaxValueCheck, type: :model do
 
   let(:page_id) { "prefix_buyer_1_income_max_value_check" }
   let(:page_definition) { nil }
-  let(:subsection) { instance_double(Form::Subsection) }
+  let(:form) { instance_double(Form, start_date: Time.zone.local(2024, 4, 1)) }
+  let(:subsection) { instance_double(Form::Subsection, form:) }
 
   it "has correct subsection" do
     expect(page.subsection).to eq(subsection)
diff --git a/spec/models/form/sales/pages/buyer1_income_min_value_check_spec.rb b/spec/models/form/sales/pages/buyer1_income_min_value_check_spec.rb
index 1736daef7..79d61ce06 100644
--- a/spec/models/form/sales/pages/buyer1_income_min_value_check_spec.rb
+++ b/spec/models/form/sales/pages/buyer1_income_min_value_check_spec.rb
@@ -5,7 +5,8 @@ RSpec.describe Form::Sales::Pages::Buyer1IncomeMinValueCheck, type: :model do
 
   let(:page_id) { "prefix_buyer_1_income_min_value_check" }
   let(:page_definition) { nil }
-  let(:subsection) { instance_double(Form::Subsection) }
+  let(:form) { instance_double(Form, start_date: Time.zone.local(2024, 4, 1)) }
+  let(:subsection) { instance_double(Form::Subsection, form:) }
 
   it "has correct subsection" do
     expect(page.subsection).to eq(subsection)
diff --git a/spec/models/form/sales/pages/buyer2_income_max_value_check_spec.rb b/spec/models/form/sales/pages/buyer2_income_max_value_check_spec.rb
index 440a6bb13..f467db18d 100644
--- a/spec/models/form/sales/pages/buyer2_income_max_value_check_spec.rb
+++ b/spec/models/form/sales/pages/buyer2_income_max_value_check_spec.rb
@@ -5,7 +5,8 @@ RSpec.describe Form::Sales::Pages::Buyer2IncomeMaxValueCheck, type: :model do
 
   let(:page_id) { "prefix_buyer_2_income_max_value_check" }
   let(:page_definition) { nil }
-  let(:subsection) { instance_double(Form::Subsection) }
+  let(:form) { instance_double(Form, start_date: Time.zone.local(2024, 4, 1)) }
+  let(:subsection) { instance_double(Form::Subsection, form:) }
 
   it "has correct subsection" do
     expect(page.subsection).to eq(subsection)
diff --git a/spec/models/form/sales/pages/buyer2_income_min_value_check_spec.rb b/spec/models/form/sales/pages/buyer2_income_min_value_check_spec.rb
index 887dcab29..44b85ef9e 100644
--- a/spec/models/form/sales/pages/buyer2_income_min_value_check_spec.rb
+++ b/spec/models/form/sales/pages/buyer2_income_min_value_check_spec.rb
@@ -5,7 +5,8 @@ RSpec.describe Form::Sales::Pages::Buyer2IncomeMinValueCheck, type: :model do
 
   let(:page_id) { "prefix_buyer_2_income_min_value_check" }
   let(:page_definition) { nil }
-  let(:subsection) { instance_double(Form::Subsection) }
+  let(:form) { instance_double(Form, start_date: Time.zone.local(2024, 4, 1)) }
+  let(:subsection) { instance_double(Form::Subsection, form:) }
 
   it "has correct subsection" do
     expect(page.subsection).to eq(subsection)
diff --git a/spec/models/form/sales/pages/combined_income_max_value_check_spec.rb b/spec/models/form/sales/pages/combined_income_max_value_check_spec.rb
index c79cb38da..f9b9954d9 100644
--- a/spec/models/form/sales/pages/combined_income_max_value_check_spec.rb
+++ b/spec/models/form/sales/pages/combined_income_max_value_check_spec.rb
@@ -5,7 +5,8 @@ RSpec.describe Form::Sales::Pages::CombinedIncomeMaxValueCheck, type: :model do
 
   let(:page_id) { "prefix_combined_income_max_value_check" }
   let(:page_definition) { nil }
-  let(:subsection) { instance_double(Form::Subsection) }
+  let(:form) { instance_double(Form, start_date: Time.zone.local(2024, 4, 1)) }
+  let(:subsection) { instance_double(Form::Subsection, form:) }
 
   it "has correct subsection" do
     expect(page.subsection).to eq(subsection)
diff --git a/spec/models/form/sales/pages/deposit_value_check_spec.rb b/spec/models/form/sales/pages/deposit_value_check_spec.rb
index 5c4cd3608..dcd12449c 100644
--- a/spec/models/form/sales/pages/deposit_value_check_spec.rb
+++ b/spec/models/form/sales/pages/deposit_value_check_spec.rb
@@ -5,7 +5,8 @@ RSpec.describe Form::Sales::Pages::DepositValueCheck, type: :model do
 
   let(:page_id) { "deposit_value_check" }
   let(:page_definition) { nil }
-  let(:subsection) { instance_double(Form::Subsection) }
+  let(:form) { instance_double(Form, start_date: Time.zone.local(2024, 4, 1)) }
+  let(:subsection) { instance_double(Form::Subsection, form:) }
 
   it "has correct subsection" do
     expect(page.subsection).to eq(subsection)
diff --git a/spec/models/form/sales/pages/mortgage_value_check_spec.rb b/spec/models/form/sales/pages/mortgage_value_check_spec.rb
index e4dc11bbc..be5aa5a77 100644
--- a/spec/models/form/sales/pages/mortgage_value_check_spec.rb
+++ b/spec/models/form/sales/pages/mortgage_value_check_spec.rb
@@ -6,7 +6,8 @@ RSpec.describe Form::Sales::Pages::MortgageValueCheck, type: :model do
   let(:page_id) { "buyer_1_income_mortgage_value_check" }
   let(:page_definition) { nil }
   let(:index) { 1 }
-  let(:subsection) { instance_double(Form::Subsection) }
+  let(:form) { instance_double(Form, start_date: Time.zone.local(2024, 4, 1)) }
+  let(:subsection) { instance_double(Form::Subsection, form:) }
 
   it "has correct subsection" do
     expect(page.subsection).to eq(subsection)
diff --git a/spec/models/form/sales/pages/savings_value_check_spec.rb b/spec/models/form/sales/pages/savings_value_check_spec.rb
index 81672977d..e680ff5d1 100644
--- a/spec/models/form/sales/pages/savings_value_check_spec.rb
+++ b/spec/models/form/sales/pages/savings_value_check_spec.rb
@@ -5,7 +5,8 @@ RSpec.describe Form::Sales::Pages::SavingsValueCheck, type: :model do
 
   let(:page_id) { "savings_value_check" }
   let(:page_definition) { nil }
-  let(:subsection) { instance_double(Form::Subsection) }
+  let(:form) { instance_double(Form, start_date: Time.zone.local(2024, 4, 1)) }
+  let(:subsection) { instance_double(Form::Subsection, form:) }
 
   it "has correct subsection" do
     expect(page.subsection).to eq(subsection)
diff --git a/spec/models/form/sales/subsections/discounted_ownership_scheme_spec.rb b/spec/models/form/sales/subsections/discounted_ownership_scheme_spec.rb
index e703e713a..bfd5313fb 100644
--- a/spec/models/form/sales/subsections/discounted_ownership_scheme_spec.rb
+++ b/spec/models/form/sales/subsections/discounted_ownership_scheme_spec.rb
@@ -5,7 +5,8 @@ RSpec.describe Form::Sales::Subsections::DiscountedOwnershipScheme, type: :model
 
   let(:subsection_id) { nil }
   let(:subsection_definition) { nil }
-  let(:section) { instance_double(Form::Sales::Sections::SaleInformation) }
+  let(:form) { instance_double(Form, start_date: Time.zone.local(2024, 4, 1)) }
+  let(:section) { instance_double(Form::Sales::Sections::SaleInformation, form:) }
 
   it "has correct section" do
     expect(discounted_ownership_scheme.section).to eq(section)
diff --git a/spec/models/form/sales/subsections/shared_ownership_scheme_spec.rb b/spec/models/form/sales/subsections/shared_ownership_scheme_spec.rb
index ea3fcd40e..922281fd0 100644
--- a/spec/models/form/sales/subsections/shared_ownership_scheme_spec.rb
+++ b/spec/models/form/sales/subsections/shared_ownership_scheme_spec.rb
@@ -8,7 +8,7 @@ RSpec.describe Form::Sales::Subsections::SharedOwnershipScheme, type: :model do
   let(:section) { instance_double(Form::Sales::Sections::SaleInformation) }
 
   before do
-    allow(section).to receive(:form).and_return(instance_double(Form, start_year_after_2024?: false))
+    allow(section).to receive(:form).and_return(instance_double(Form, start_year_after_2024?: false, start_date: Time.zone.local(2023, 4, 1)))
   end
 
   it "has correct section" do
diff --git a/spec/models/validations/sales/household_validations_spec.rb b/spec/models/validations/sales/household_validations_spec.rb
index 510681420..cffb42ab1 100644
--- a/spec/models/validations/sales/household_validations_spec.rb
+++ b/spec/models/validations/sales/household_validations_spec.rb
@@ -15,11 +15,11 @@ RSpec.describe Validations::Sales::HouseholdValidations do
       record.relat3 = "P"
       household_validator.validate_partner_count(record)
       expect(record.errors["relat2"])
-        .to include(match I18n.t("validations.household.relat.one_partner"))
+        .to include(match I18n.t("validations.sales.household.relat.one_partner"))
       expect(record.errors["relat3"])
-        .to include(match I18n.t("validations.household.relat.one_partner"))
+        .to include(match I18n.t("validations.sales.household.relat.one_partner"))
       expect(record.errors["relat4"])
-        .not_to include(match I18n.t("validations.household.relat.one_partner"))
+        .not_to include(match I18n.t("validations.sales.household.relat.one_partner"))
     end
 
     it "expects that a tenant can have a partner" do
@@ -47,9 +47,9 @@ RSpec.describe Validations::Sales::HouseholdValidations do
           record.relat2 = "P"
           household_validator.validate_person_age_matches_relationship(record)
           expect(record.errors["relat2"])
-            .to include(match I18n.t("validations.household.relat.child_under_16_sales", person_num: 2))
+            .to include(match I18n.t("validations.sales.household.relat.child_under_16", person_num: 2))
           expect(record.errors["age2"])
-            .to include(match I18n.t("validations.household.age.child_under_16_relat_sales", person_num: 2))
+            .to include(match I18n.t("validations.sales.household.age.child_under_16", person_num: 2))
         end
       end
 
@@ -58,9 +58,9 @@ RSpec.describe Validations::Sales::HouseholdValidations do
         record.relat2 = "C"
         household_validator.validate_person_age_matches_relationship(record)
         expect(record.errors["relat2"])
-          .to include(match I18n.t("validations.household.relat.child_over_20"))
+          .to include(match I18n.t("validations.sales.household.relat.child_over_20"))
         expect(record.errors["age2"])
-          .to include(match I18n.t("validations.household.age.child_over_20"))
+          .to include(match I18n.t("validations.sales.household.age.child_over_20"))
       end
     end
 
@@ -94,9 +94,9 @@ RSpec.describe Validations::Sales::HouseholdValidations do
         record.ecstat2 = 1
         household_validator.validate_person_age_matches_economic_status(record)
         expect(record.errors["ecstat2"])
-          .to include(match I18n.t("validations.household.ecstat.child_under_16", person_num: 2))
+          .to include(match I18n.t("validations.sales.household.ecstat.child_under_16", person_num: 2))
         expect(record.errors["age2"])
-          .to include(match I18n.t("validations.household.age.child_under_16_ecstat", person_num: 2))
+          .to include(match I18n.t("validations.sales.household.age.child_under_16_ecstat", person_num: 2))
       end
 
       it "expects that person's economic status is Child" do
@@ -112,9 +112,9 @@ RSpec.describe Validations::Sales::HouseholdValidations do
         record.ecstat2 = 9
         household_validator.validate_person_age_matches_economic_status(record)
         expect(record.errors["ecstat2"])
-          .to include(match I18n.t("validations.household.ecstat.child_over_16", person_num: 2))
+          .to include(match I18n.t("validations.sales.household.ecstat.child_over_16", person_num: 2))
         expect(record.errors["age2"])
-          .to include(match I18n.t("validations.household.age.child_over_16", person_num: 2))
+          .to include(match I18n.t("validations.sales.household.age.child_over_16", person_num: 2))
       end
     end
 
@@ -126,9 +126,9 @@ RSpec.describe Validations::Sales::HouseholdValidations do
         record.ecstat2 = 1
         household_validator.validate_person_age_matches_economic_status(record)
         expect(record.errors["ecstat2"])
-          .not_to include(match I18n.t("validations.household.ecstat.child_under_16", person_num: 2))
+          .not_to include(match I18n.t("validations.sales.household.ecstat.child_under_16", person_num: 2))
         expect(record.errors["age2"])
-          .not_to include(match I18n.t("validations.household.age.child_under_16_ecstat", person_num: 2))
+          .not_to include(match I18n.t("validations.sales.household.age.child_under_16_ecstat", person_num: 2))
       end
     end
   end
@@ -143,11 +143,11 @@ RSpec.describe Validations::Sales::HouseholdValidations do
         record.relat2 = "C"
         household_validator.validate_child_12_years_younger(record)
         expect(record.errors["age1"])
-          .to include(match I18n.t("validations.household.age.child_12_years_younger", person_num: 2))
+          .to include(match I18n.t("validations.sales.household.age.child_12_years_younger", person_num: 2))
         expect(record.errors["age2"])
-          .to include(match I18n.t("validations.household.age.child_12_years_younger", person_num: 2))
+          .to include(match I18n.t("validations.sales.household.age.child_12_years_younger", person_num: 2))
         expect(record.errors["relat2"])
-          .to include(match I18n.t("validations.household.age.child_12_years_younger", person_num: 2))
+          .to include(match I18n.t("validations.sales.household.age.child_12_years_younger", person_num: 2))
       end
 
       it "expects the child is at least 12 years younger than buyer 1" do
@@ -206,11 +206,11 @@ RSpec.describe Validations::Sales::HouseholdValidations do
         record.relat2 = "C"
         household_validator.validate_person_age_and_relationship_matches_economic_status(record)
         expect(record.errors["relat2"])
-          .to include(match I18n.t("validations.household.relat.student_16_19.cannot_be_child.16_19_not_student"))
+          .to include(match I18n.t("validations.sales.household.relat.student_16_19.cannot_be_child.16_19_not_student"))
         expect(record.errors["age2"])
-          .to include(match I18n.t("validations.household.age.student_16_19.cannot_be_16_19.child_not_student"))
+          .to include(match I18n.t("validations.sales.household.age.student_16_19.cannot_be_16_19.child_not_student"))
         expect(record.errors["ecstat2"])
-          .to include(match I18n.t("validations.household.ecstat.student_16_19.must_be_student"))
+          .to include(match I18n.t("validations.sales.household.ecstat.student_16_19.must_be_student"))
       end
 
       it "adds errors for a person who is a child of the buyer and a student but not aged 16-19" do
@@ -219,11 +219,11 @@ RSpec.describe Validations::Sales::HouseholdValidations do
         record.relat2 = "C"
         household_validator.validate_person_age_and_relationship_matches_economic_status(record)
         expect(record.errors["relat2"])
-          .to include(match I18n.t("validations.household.relat.student_16_19.cannot_be_child.student_not_16_19"))
+          .to include(match I18n.t("validations.sales.household.relat.student_16_19.cannot_be_child.student_not_16_19"))
         expect(record.errors["age2"])
-          .to include(match I18n.t("validations.household.age.student_16_19.must_be_16_19"))
+          .to include(match I18n.t("validations.sales.household.age.student_16_19.must_be_16_19"))
         expect(record.errors["ecstat2"])
-          .to include(match I18n.t("validations.household.ecstat.student_16_19.cannot_be_student.child_not_16_19"))
+          .to include(match I18n.t("validations.sales.household.ecstat.student_16_19.cannot_be_student.child_not_16_19"))
       end
     end
 
@@ -316,9 +316,9 @@ RSpec.describe Validations::Sales::HouseholdValidations do
           it "triggers a validation if buyer two will also not live in the property" do
             sales_log.buy2livein = 2
             household_validator.validate_buyers_living_in_property(sales_log)
-            expect(sales_log.errors[:buylivein]).to include I18n.t("validations.household.buylivein.buyers_will_live_in_property_values_inconsistent_setup")
-            expect(sales_log.errors[:buy2livein]).to include I18n.t("validations.household.buylivein.buyers_will_live_in_property_values_inconsistent")
-            expect(sales_log.errors[:buy1livein]).to include I18n.t("validations.household.buylivein.buyers_will_live_in_property_values_inconsistent")
+            expect(sales_log.errors[:buylivein]).to include I18n.t("validations.sales.household.buylivein.buyers_will_live_in_property_values_inconsistent")
+            expect(sales_log.errors[:buy2livein]).to include I18n.t("validations.sales.household.buy2livein.buyers_will_live_in_property_values_inconsistent")
+            expect(sales_log.errors[:buy1livein]).to include I18n.t("validations.sales.household.buy1livein.buyers_will_live_in_property_values_inconsistent")
           end
         end
       end
diff --git a/spec/requests/collection_resources_controller_spec.rb b/spec/requests/collection_resources_controller_spec.rb
index 7c9bb0f05..a6d88f911 100644
--- a/spec/requests/collection_resources_controller_spec.rb
+++ b/spec/requests/collection_resources_controller_spec.rb
@@ -62,7 +62,7 @@ RSpec.describe CollectionResourcesController, type: :request do
         expect(page).to have_content("Sales 2025 to 2026")
       end
 
-      it "displays mandatory filed" do
+      it "displays mandatory files" do
         get collection_resources_path
 
         expect(page).to have_content("Paper form")
@@ -70,6 +70,15 @@ RSpec.describe CollectionResourcesController, type: :request do
         expect(page).to have_content("Bulk upload specification")
       end
 
+      it "allows uploading new resources" do
+        get collection_resources_path
+
+        expect(page).to have_link("Add new sales 2024 to 2025 resource", href: new_collection_resource_path(year: 2024, log_type: "sales"))
+        expect(page).to have_link("Add new lettings 2024 to 2025 resource", href: new_collection_resource_path(year: 2024, log_type: "lettings"))
+        expect(page).to have_link("Add new sales 2025 to 2026 resource", href: new_collection_resource_path(year: 2025, log_type: "sales"))
+        expect(page).to have_link("Add new lettings 2025 to 2026 resource", href: new_collection_resource_path(year: 2025, log_type: "lettings"))
+      end
+
       context "when files are on S3" do
         before do
           allow(storage_service).to receive(:file_exists?).and_return(true)
@@ -113,6 +122,16 @@ RSpec.describe CollectionResourcesController, type: :request do
           expect(page).to have_content("The 2025 to 2026 collection resources are not yet available to users.")
           expect(page).to have_link("Release the 2025 to 2026 collection resources to users", href: confirm_mandatory_collection_resources_release_path(year: 2025))
         end
+
+        context "when there are additional resources" do
+          let!(:collection_resource) { create(:collection_resource, :additional, year: 2025, short_display_name: "additional resource", download_filename: "additional.pdf") }
+
+          it "displays change links for additional resources" do
+            get collection_resources_path
+
+            expect(page).to have_link("Change", href: collection_resource_edit_path(collection_resource))
+          end
+        end
       end
 
       context "when files are not on S3" do
@@ -147,6 +166,26 @@ RSpec.describe CollectionResourcesController, type: :request do
           expect(page).to have_content("Once you have uploaded all the required 2025 to 2026 collection resources, you will be able to release them to users.")
         end
       end
+
+      context "when there are additional resources" do
+        let!(:collection_resource) { create(:collection_resource, :additional, year: 2025, short_display_name: "additional resource", download_filename: "additional.pdf") }
+
+        before do
+          # rubocop:disable RSpec/AnyInstance
+          allow_any_instance_of(CollectionResourcesHelper).to receive(:editable_collection_resource_years).and_return([2025])
+          # rubocop:enable RSpec/AnyInstance
+          create(:collection_resource, :additional, year: 2026, short_display_name: "additional resource 2")
+        end
+
+        it "displays additional resources for editable years" do
+          get collection_resources_path
+
+          expect(page).to have_content("additional resource")
+          expect(page).not_to have_content("additional resource 2")
+          expect(page).to have_link("additional.pdf", href: collection_resource_download_path(collection_resource))
+          expect(page).to have_link("Delete")
+        end
+      end
     end
   end
 
@@ -473,4 +512,305 @@ RSpec.describe CollectionResourcesController, type: :request do
       end
     end
   end
+
+  describe "GET #new_collection_resource" do
+    context "when user is not signed in" do
+      it "redirects to the sign in page" do
+        get new_collection_resource_path(year: 2025, log_type: "sales")
+        expect(response).to redirect_to(new_user_session_path)
+      end
+    end
+
+    context "when user is signed in as a data coordinator" do
+      let(:user) { create(:user, :data_coordinator) }
+
+      before do
+        sign_in user
+      end
+
+      it "returns page not found" do
+        get new_collection_resource_path(year: 2025, log_type: "sales")
+        expect(response).to have_http_status(:not_found)
+      end
+    end
+
+    context "when user is signed in as a data provider" do
+      let(:user) { create(:user, :data_provider) }
+
+      before do
+        sign_in user
+      end
+
+      it "returns page not found" do
+        get new_collection_resource_path(year: 2025, log_type: "sales")
+        expect(response).to have_http_status(:not_found)
+      end
+    end
+
+    context "when user is signed in as a support user" do
+      let(:user) { create(:user, :support) }
+
+      before do
+        # rubocop:disable RSpec/AnyInstance
+        allow_any_instance_of(CollectionResourcesHelper).to receive(:editable_collection_resource_years).and_return([2025, 2026])
+        # rubocop:enable RSpec/AnyInstance
+        allow(user).to receive(:need_two_factor_authentication?).and_return(false)
+        sign_in user
+      end
+
+      it "displays new collection resource page content" do
+        get new_collection_resource_path(year: 2025, log_type: "sales")
+
+        expect(page).to have_content("Sales 2025 to 2026")
+        expect(page).to have_content("Add a new collection resource")
+        expect(page).to have_content("Upload file")
+        expect(page).to have_button("Add resource")
+        expect(page).to have_link("Back", href: collection_resources_path)
+        expect(page).to have_link("Cancel", href: collection_resources_path)
+      end
+    end
+  end
+
+  describe "POST #collection_resources" do
+    let(:some_file) { File.open(file_fixture("blank_bulk_upload_sales.csv")) }
+    let(:params) { { collection_resource: { year: 2025, log_type: "sales", file: some_file, display_name: "some file" } } }
+
+    context "when user is not signed in" do
+      it "redirects to the sign in page" do
+        post collection_resources_path, params: params
+        expect(response).to redirect_to(new_user_session_path)
+      end
+    end
+
+    context "when user is signed in as a data coordinator" do
+      let(:user) { create(:user, :data_coordinator) }
+
+      before do
+        sign_in user
+      end
+
+      it "returns page not found" do
+        post collection_resources_path, params: params
+        expect(response).to have_http_status(:not_found)
+      end
+    end
+
+    context "when user is signed in as a data provider" do
+      let(:user) { create(:user, :data_provider) }
+
+      before do
+        sign_in user
+      end
+
+      it "returns page not found" do
+        post collection_resources_path, params: params
+        expect(response).to have_http_status(:not_found)
+      end
+    end
+  end
+
+  describe "GET #download_additional_collection_resource" do
+    let(:collection_resource) { create(:collection_resource, :additional, year: 2025, short_display_name: "additional resource") }
+
+    before do
+      # rubocop:disable RSpec/AnyInstance
+      allow_any_instance_of(CollectionResourcesHelper).to receive(:editable_collection_resource_years).and_return([2025, 2026])
+      allow_any_instance_of(CollectionResourcesHelper).to receive(:displayed_collection_resource_years).and_return([2025])
+      # rubocop:enable RSpec/AnyInstance
+    end
+
+    context "when the user is not signed in" do
+      context "when the file exists on S3" do
+        before do
+          allow(storage_service).to receive(:get_file).and_return("file")
+          get collection_resource_download_path(collection_resource)
+        end
+
+        it "downloads the file" do
+          expect(response.body).to eq("file")
+        end
+      end
+    end
+
+    context "when user is signed in as a data coordinator" do
+      let(:user) { create(:user, :data_coordinator) }
+
+      context "when the file exists on S3" do
+        before do
+          sign_in user
+          allow(storage_service).to receive(:get_file).and_return("file")
+          get collection_resource_download_path(collection_resource)
+        end
+
+        it "downloads the file" do
+          expect(response.body).to eq("file")
+        end
+      end
+
+      context "when the file does not exist on S3" do
+        before do
+          sign_in user
+          allow(storage_service).to receive(:get_file).and_return(nil)
+          get collection_resource_download_path(collection_resource)
+        end
+
+        it "returns page not found" do
+          expect(response).to have_http_status(:not_found)
+        end
+      end
+
+      context "when resource id is invalid" do
+        before do
+          sign_in user
+          allow(storage_service).to receive(:get_file).and_return(nil)
+          get collection_resource_download_path(collection_resource_id: "invalid")
+        end
+
+        it "returns page not found" do
+          expect(response).to have_http_status(:not_found)
+        end
+      end
+
+      context "when year not in displayed_collection_resource_years" do
+        let(:collection_resource) { create(:collection_resource, :additional, year: 2026, short_display_name: "additional resource") }
+
+        before do
+          sign_in user
+          get collection_resource_download_path(collection_resource)
+        end
+
+        it "returns page not found" do
+          expect(response).to have_http_status(:not_found)
+        end
+      end
+    end
+
+    context "when user is signed in as a support user" do
+      let(:collection_resource) { create(:collection_resource, :additional, year: 2026, short_display_name: "additional resource") }
+      let(:user) { create(:user, :support) }
+
+      context "when year is in editable_collection_resource_years but not in displayed_collection_resource_years" do
+        before do
+          allow(user).to receive(:need_two_factor_authentication?).and_return(false)
+          sign_in user
+          allow(storage_service).to receive(:get_file).and_return("file")
+          get collection_resource_download_path(collection_resource)
+        end
+
+        it "downloads the file" do
+          expect(response.status).to eq(200)
+          expect(response.body).to eq("file")
+        end
+      end
+    end
+  end
+
+  describe "GET #edit_additional_collection_resource" do
+    let(:collection_resource) { create(:collection_resource, :additional, year: 2025, log_type: "sales", short_display_name: "additional resource", download_filename: "additional.pdf") }
+
+    context "when user is not signed in" do
+      it "redirects to the sign in page" do
+        get collection_resource_edit_path(collection_resource)
+        expect(response).to redirect_to(new_user_session_path)
+      end
+    end
+
+    context "when user is signed in as a data coordinator" do
+      let(:user) { create(:user, :data_coordinator) }
+
+      before do
+        sign_in user
+      end
+
+      it "returns page not found" do
+        get collection_resource_edit_path(collection_resource)
+        expect(response).to have_http_status(:not_found)
+      end
+    end
+
+    context "when user is signed in as a data provider" do
+      let(:user) { create(:user, :data_provider) }
+
+      before do
+        sign_in user
+      end
+
+      it "returns page not found" do
+        get collection_resource_edit_path(collection_resource)
+        expect(response).to have_http_status(:not_found)
+      end
+    end
+
+    context "when user is signed in as a support user" do
+      let(:user) { create(:user, :support) }
+
+      before do
+        allow(Time.zone).to receive(:today).and_return(Time.zone.local(2025, 1, 8))
+        allow(user).to receive(:need_two_factor_authentication?).and_return(false)
+        sign_in user
+      end
+
+      context "and the file exists on S3" do
+        before do
+          allow(storage_service).to receive(:file_exists?).and_return(true)
+        end
+
+        it "displays update collection resources page content" do
+          get collection_resource_edit_path(collection_resource)
+
+          expect(page).to have_content("Sales 2025 to 2026")
+          expect(page).to have_content("Change the additional resource")
+          expect(page).to have_content("This file will be available for all users to download.")
+          expect(page).to have_content("Upload file")
+          expect(page).to have_button("Save changes")
+          expect(page).to have_link("Back", href: collection_resources_path)
+          expect(page).to have_link("Cancel", href: collection_resources_path)
+        end
+      end
+    end
+  end
+
+  describe "PATCH #update_additional_collection_resource" do
+    let(:some_file) { File.open(file_fixture("blank_bulk_upload_sales.csv")) }
+    let(:params) { { collection_resource: { short_display_name: "short name", file: some_file } } }
+    let(:collection_resource_service) { instance_double(CollectionResourcesService) }
+    let(:collection_resource) { create(:collection_resource, :additional, year: 2025, log_type: "sales", short_display_name: "additional resource", download_filename: "additional.pdf") }
+
+    before do
+      allow(CollectionResourcesService).to receive(:new).and_return(collection_resource_service)
+    end
+
+    context "when user is not signed in" do
+      it "redirects to the sign in page" do
+        patch collection_resource_update_path(collection_resource), params: params
+        expect(response).to redirect_to(new_user_session_path)
+      end
+    end
+
+    context "when user is signed in as a data coordinator" do
+      let(:user) { create(:user, :data_coordinator) }
+
+      before do
+        sign_in user
+      end
+
+      it "returns page not found" do
+        patch collection_resource_update_path(collection_resource), params: params
+        expect(response).to have_http_status(:not_found)
+      end
+    end
+
+    context "when user is signed in as a data provider" do
+      let(:user) { create(:user, :data_provider) }
+
+      before do
+        sign_in user
+      end
+
+      it "returns page not found" do
+        patch collection_resource_update_path(collection_resource), params: params
+        expect(response).to have_http_status(:not_found)
+      end
+    end
+  end
 end
diff --git a/spec/requests/start_controller_spec.rb b/spec/requests/start_controller_spec.rb
index db884d09f..b3846809c 100644
--- a/spec/requests/start_controller_spec.rb
+++ b/spec/requests/start_controller_spec.rb
@@ -324,6 +324,7 @@ RSpec.describe StartController, type: :request do
 
       context "and 2023 collection window is open for editing" do
         before do
+          create(:collection_resource, :additional, year: 2023, log_type: "sales", display_name: "sales additional resource (2023 to 2024)")
           allow(Time).to receive(:now).and_return(Time.zone.local(2024, 4, 1))
         end
 
@@ -337,6 +338,7 @@ RSpec.describe StartController, type: :request do
           expect(page).to have_content("Sales 23/24")
           expect(page).to have_content("Sales 2024 to 2025")
           expect(page).to have_content("Sales 2023 to 2024")
+          expect(page).to have_content("Download the sales additional resource (2023 to 2024)")
         end
       end
 
diff --git a/spec/services/collection_resources_service_spec.rb b/spec/services/collection_resources_service_spec.rb
index 3786b70c9..602e36c38 100644
--- a/spec/services/collection_resources_service_spec.rb
+++ b/spec/services/collection_resources_service_spec.rb
@@ -12,7 +12,7 @@ describe CollectionResourcesService do
     end
 
     it "calls write_file on S3 service" do
-      expect(storage_service).to receive(:write_file).with("2025_26_lettings_paper_form.pdf", some_file)
+      expect(storage_service).to receive(:write_file).with("2025_26_lettings_paper_form.pdf", some_file, content_type: "application/pdf")
       service.upload_collection_resource("2025_26_lettings_paper_form.pdf", some_file)
     end
   end