diff --git a/app/controllers/collection_resources_controller.rb b/app/controllers/collection_resources_controller.rb
index 54d9ccad7..f031d8999 100644
--- a/app/controllers/collection_resources_controller.rb
+++ b/app/controllers/collection_resources_controller.rb
@@ -100,12 +100,12 @@ class CollectionResourcesController < ApplicationController
     return render_not_found unless resource_for_year_can_be_updated?(@collection_resource.year)
 
     @collection_resource.file = resource_params[:file]
-    @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)})"
     @collection_resource.validate_attached_file
     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)
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/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/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