diff --git a/.github/workflows/staging_pipeline.yml b/.github/workflows/staging_pipeline.yml
index 415a943d1..8c0553741 100644
--- a/.github/workflows/staging_pipeline.yml
+++ b/.github/workflows/staging_pipeline.yml
@@ -14,6 +14,11 @@ defaults:
   run:
     shell: bash
 
+env:
+  app_repo_role: arn:aws:iam::815624722760:role/core-application-repo
+  aws_region: eu-west-2
+  repository: core
+
 jobs:
   test:
     name: Tests
@@ -364,3 +369,48 @@ jobs:
       environment: staging
     permissions:
       id-token: write
+
+  performance:
+    needs: [aws_deploy]
+    runs-on: ubuntu-latest
+    permissions:
+      id-token: write
+
+    steps:
+      - name: Configure AWS credentials
+        uses: aws-actions/configure-aws-credentials@v3
+        with:
+          aws-region: ${{ env.aws_region }}
+          role-to-assume: ${{ env.app_repo_role }}
+
+      - name: Configure AWS credentials for the environment
+        uses: aws-actions/configure-aws-credentials@v3
+        with:
+          aws-region: eu-west-2
+          role-to-assume: arn:aws:iam::107155005276:role/core-staging-deployment
+          role-chaining: true
+
+      - name: Run Performance Test
+        env:
+          ad_hoc_task_definition: core-staging-ad-hoc
+          cluster: core-staging-app
+          service: core-staging-app
+        run: |
+          echo $cluster
+          network=$(aws ecs describe-services --cluster $cluster --services $service --query services[0].networkConfiguration)
+          overrides='{
+            "containerOverrides": [{
+              "name": "app",
+              "command": ["bash", "-c", "export email=$STAGING_PERFORMANCE_TEST_EMAIL && export password=$STAGING_PERFORMANCE_TEST_PASSWORD && sh ./lib/tasks/performance_test.sh"]
+            }]
+          }'
+          arn=$(aws ecs run-task --cluster $cluster --task-definition $ad_hoc_task_definition --network-configuration "$network" --overrides "$overrides" --group performance --launch-type FARGATE --query tasks[0].taskArn)
+
+          echo "Waiting for performance tests to run"
+          task_id=${arn##*/}
+          task_id=${task_id%*\"}
+
+          aws ecs wait tasks-stopped --cluster $cluster --tasks $task_id
+
+          code=$(aws ecs describe-tasks --cluster $cluster --tasks $task_id --query "tasks[0].containers[0].exitCode")
+          if [ "$code == 0" ]; then exit 0; else exit 1; fi
diff --git a/Dockerfile b/Dockerfile
index 6eeee6511..46bd31b5f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -31,6 +31,9 @@ EXPOSE ${PORT}
 
 RUN adduser --system --no-create-home nonroot
 
+RUN apk add curl
+RUN apk add apache2-utils
+
 FROM base as test
 
 RUN bundle config set without ""
@@ -67,6 +70,9 @@ RUN mkdir -p tmp log
 RUN chown -R nonroot tmp log
 RUN chown nonroot db/schema.rb
 
+RUN mkdir -p performance_test
+RUN chown -R nonroot performance_test
+
 USER nonroot
 
 CMD bundle exec rails s -e ${RAILS_ENV} -p ${PORT} --binding=0.0.0.0
diff --git a/app/components/bulk_upload_error_row_component.html.erb b/app/components/bulk_upload_error_row_component.html.erb
index 9447c9d37..65e38613f 100644
--- a/app/components/bulk_upload_error_row_component.html.erb
+++ b/app/components/bulk_upload_error_row_component.html.erb
@@ -9,24 +9,27 @@
 
   <div class="govuk-summary-card__content">
     <% potential_errors, critical_errors = bulk_upload_errors.partition { |error| error.category == "soft_validation" } %>
-    <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| %>
-      <%= table.with_head do |head| %>
-        <% head.with_row do |row| %>
-          <% row.with_cell(header: true, text: "Cell") %>
-          <% row.with_cell(header: true, text: "Question") %>
-          <% row.with_cell(header: true, text: "Error") %>
-          <% row.with_cell(header: true, text: "Specification") %>
-        <% end %>
 
-        <%= table.with_body do |body| %>
-          <% critical_errors.each do |error| %>
-            <% body.with_row do |row| %>
-                <% row.with_cell(text: error.cell) %>
-                <% row.with_cell(text: question_for_field(error.field), html_attributes: { class: "govuk-!-width-one-half" }) %>
-                <% row.with_cell(text: error.error.html_safe, html_attributes: { class: "govuk-!-font-weight-bold govuk-!-width-one-half" }) %>
-                <% row.with_cell(text: error.field.humanize) %>
+    <% 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| %>
+        <%= table.with_head do |head| %>
+          <% head.with_row do |row| %>
+            <% row.with_cell(header: true, text: "Cell") %>
+            <% row.with_cell(header: true, text: "Question") %>
+            <% row.with_cell(header: true, text: "Error") %>
+            <% row.with_cell(header: true, text: "Specification") %>
+          <% end %>
+
+          <%= table.with_body do |body| %>
+            <% critical_errors.each do |error| %>
+              <% body.with_row do |row| %>
+                  <% row.with_cell(text: error.cell) %>
+                  <% row.with_cell(text: question_for_field(error.field), html_attributes: { class: "govuk-!-width-one-half" }) %>
+                  <% row.with_cell(text: error.error.html_safe, html_attributes: { class: "govuk-!-font-weight-bold govuk-!-width-one-half" }) %>
+                  <% row.with_cell(text: error.field.humanize) %>
+              <% end %>
             <% end %>
           <% end %>
         <% end %>
diff --git a/app/controllers/bulk_upload_lettings_logs_controller.rb b/app/controllers/bulk_upload_lettings_logs_controller.rb
index 465bbc5f6..a8ad14f9e 100644
--- a/app/controllers/bulk_upload_lettings_logs_controller.rb
+++ b/app/controllers/bulk_upload_lettings_logs_controller.rb
@@ -4,9 +4,9 @@ class BulkUploadLettingsLogsController < ApplicationController
 
   def start
     if have_choice_of_year?
-      redirect_to bulk_upload_lettings_log_path(id: "year")
+      redirect_to bulk_upload_lettings_log_path(id: "year", form: { organisation_id: params[:organisation_id] }.compact)
     else
-      redirect_to bulk_upload_lettings_log_path(id: "prepare-your-file", form: { year: current_year })
+      redirect_to bulk_upload_lettings_log_path(id: "prepare-your-file", form: { year: current_year, organisation_id: params[:organisation_id] }.compact)
     end
   end
 
@@ -60,6 +60,6 @@ private
   end
 
   def form_params
-    params.fetch(:form, {}).permit(:year, :needstype, :file)
+    params.fetch(:form, {}).permit(:year, :needstype, :file, :organisation_id)
   end
 end
diff --git a/app/controllers/bulk_upload_sales_logs_controller.rb b/app/controllers/bulk_upload_sales_logs_controller.rb
index 56bd1d4de..2fd312d10 100644
--- a/app/controllers/bulk_upload_sales_logs_controller.rb
+++ b/app/controllers/bulk_upload_sales_logs_controller.rb
@@ -4,9 +4,9 @@ class BulkUploadSalesLogsController < ApplicationController
 
   def start
     if have_choice_of_year?
-      redirect_to bulk_upload_sales_log_path(id: "year")
+      redirect_to bulk_upload_sales_log_path(id: "year", form: { organisation_id: params[:organisation_id] }.compact)
     else
-      redirect_to bulk_upload_sales_log_path(id: "prepare-your-file", form: { year: current_year })
+      redirect_to bulk_upload_sales_log_path(id: "prepare-your-file", form: { year: current_year, organisation_id: params[:organisation_id] }.compact)
     end
   end
 
@@ -58,6 +58,6 @@ private
   end
 
   def form_params
-    params.fetch(:form, {}).permit(:year, :file)
+    params.fetch(:form, {}).permit(:year, :file, :organisation_id)
   end
 end
diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index bb119b29e..5a9203da8 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -2,6 +2,7 @@ module ApplicationHelper
   include Pagy::Frontend
 
   def browser_title(title, pagy, *resources)
+    title = sanitize(title)&.gsub("&amp;", "&")
     if resources.any? { |r| r.present? && r.errors.present? }
       "Error: #{[title, t('service_name'), 'GOV.UK'].select(&:present?).join(' - ')}"
     else
diff --git a/app/models/forms/bulk_upload_lettings/checking_file.rb b/app/models/forms/bulk_upload_lettings/checking_file.rb
index 8cd9ee696..3b43cb269 100644
--- a/app/models/forms/bulk_upload_lettings/checking_file.rb
+++ b/app/models/forms/bulk_upload_lettings/checking_file.rb
@@ -6,13 +6,18 @@ module Forms
       include Rails.application.routes.url_helpers
 
       attribute :year, :integer
+      attribute :organisation_id, :integer
 
       def view_path
         "bulk_upload_lettings_logs/forms/checking_file"
       end
 
       def back_path
-        bulk_upload_lettings_log_path(id: "start")
+        if organisation_id.present?
+          lettings_logs_organisation_path(organisation_id)
+        else
+          bulk_upload_lettings_log_path(id: "start")
+        end
       end
 
       def year_combo
diff --git a/app/models/forms/bulk_upload_lettings/guidance.rb b/app/models/forms/bulk_upload_lettings/guidance.rb
index b6cf5bf74..24bc531f2 100644
--- a/app/models/forms/bulk_upload_lettings/guidance.rb
+++ b/app/models/forms/bulk_upload_lettings/guidance.rb
@@ -7,6 +7,7 @@ module Forms
 
       attribute :year, :integer
       attribute :referrer
+      attribute :organisation_id, :integer
 
       def view_path
         "bulk_upload_shared/guidance"
@@ -15,7 +16,7 @@ module Forms
       def back_path
         case referrer
         when "prepare-your-file"
-          bulk_upload_lettings_log_path(id: "prepare-your-file", form: { year: })
+          bulk_upload_lettings_log_path(id: "prepare-your-file", form: { year:, organisation_id: }.compact)
         when "home"
           root_path
         else
diff --git a/app/models/forms/bulk_upload_lettings/needstype.rb b/app/models/forms/bulk_upload_lettings/needstype.rb
index 0cadd647c..32ed0acf3 100644
--- a/app/models/forms/bulk_upload_lettings/needstype.rb
+++ b/app/models/forms/bulk_upload_lettings/needstype.rb
@@ -7,6 +7,7 @@ module Forms
 
       attribute :needstype, :integer
       attribute :year, :integer
+      attribute :organisation_id, :integer
 
       validates :needstype, presence: true
 
@@ -19,11 +20,11 @@ module Forms
       end
 
       def back_path
-        bulk_upload_lettings_log_path(id: "prepare-your-file", form: { year:, needstype: })
+        bulk_upload_lettings_log_path(id: "prepare-your-file", form: { year:, needstype:, organisation_id: }.compact)
       end
 
       def next_path
-        bulk_upload_lettings_log_path(id: "upload-your-file", form: { year:, needstype: })
+        bulk_upload_lettings_log_path(id: "upload-your-file", form: { year:, needstype:, organisation_id: }.compact)
       end
 
       def year_combo
diff --git a/app/models/forms/bulk_upload_lettings/prepare_your_file.rb b/app/models/forms/bulk_upload_lettings/prepare_your_file.rb
index b5069d908..159436ce1 100644
--- a/app/models/forms/bulk_upload_lettings/prepare_your_file.rb
+++ b/app/models/forms/bulk_upload_lettings/prepare_your_file.rb
@@ -7,6 +7,7 @@ module Forms
 
       attribute :year, :integer
       attribute :needstype, :integer
+      attribute :organisation_id, :integer
 
       def view_path
         case year
@@ -19,15 +20,16 @@ module Forms
 
       def back_path
         if have_choice_of_year?
-          Rails.application.routes.url_helpers.bulk_upload_lettings_log_path(id: "year", form: { year: })
+          Rails.application.routes.url_helpers.bulk_upload_lettings_log_path(id: "year", form: { year:, organisation_id: }.compact)
+        elsif organisation_id.present?
+          lettings_logs_organisation_path(organisation_id)
         else
           Rails.application.routes.url_helpers.lettings_logs_path
         end
       end
 
       def next_path
-        page_id = year == 2022 ? "needstype" : "upload-your-file"
-        bulk_upload_lettings_log_path(id: page_id, form: { year:, needstype: })
+        bulk_upload_lettings_log_path(id: "upload-your-file", form: { year:, needstype:, organisation_id: }.compact)
       end
 
       def legacy_template_path
diff --git a/app/models/forms/bulk_upload_lettings/upload_your_file.rb b/app/models/forms/bulk_upload_lettings/upload_your_file.rb
index 9ccec7622..954c6e6e6 100644
--- a/app/models/forms/bulk_upload_lettings/upload_your_file.rb
+++ b/app/models/forms/bulk_upload_lettings/upload_your_file.rb
@@ -11,6 +11,7 @@ module Forms
       attribute :needstype, :integer
       attribute :file
       attribute :current_user
+      attribute :organisation_id, :integer
 
       validates :file, presence: true
       validate :validate_file_is_csv
@@ -20,8 +21,7 @@ module Forms
       end
 
       def back_path
-        page_id = year == 2022 ? "needstype" : "prepare-your-file"
-        bulk_upload_lettings_log_path(id: page_id, form: { year:, needstype: })
+        bulk_upload_lettings_log_path(id: "prepare-your-file", form: { year:, needstype:, organisation_id: }.compact)
       end
 
       def year_combo
@@ -29,7 +29,7 @@ module Forms
       end
 
       def next_path
-        bulk_upload_lettings_log_path(id: "checking-file", form: { year: })
+        bulk_upload_lettings_log_path(id: "checking-file", form: { year:, organisation_id: }.compact)
       end
 
       def save!
@@ -39,6 +39,7 @@ module Forms
           year:,
           needstype:,
           filename: file.original_filename,
+          organisation_id: (organisation_id if current_user.support?) || current_user.organisation_id,
         )
 
         storage_service.write_file(bulk_upload.identifier, File.read(file.path))
diff --git a/app/models/forms/bulk_upload_lettings/year.rb b/app/models/forms/bulk_upload_lettings/year.rb
index e199559fa..396b91a79 100644
--- a/app/models/forms/bulk_upload_lettings/year.rb
+++ b/app/models/forms/bulk_upload_lettings/year.rb
@@ -6,6 +6,7 @@ module Forms
       include Rails.application.routes.url_helpers
 
       attribute :year, :integer
+      attribute :organisation_id, :integer
 
       validates :year, presence: true
 
@@ -20,11 +21,15 @@ module Forms
       end
 
       def back_path
-        lettings_logs_path
+        if organisation_id.present?
+          lettings_logs_organisation_path(organisation_id)
+        else
+          lettings_logs_path
+        end
       end
 
       def next_path
-        bulk_upload_lettings_log_path(id: "prepare-your-file", form: { year: })
+        bulk_upload_lettings_log_path(id: "prepare-your-file", form: { year:, organisation_id: }.compact)
       end
 
       def save!
diff --git a/app/models/forms/bulk_upload_sales/checking_file.rb b/app/models/forms/bulk_upload_sales/checking_file.rb
index a37be3ccb..243d64070 100644
--- a/app/models/forms/bulk_upload_sales/checking_file.rb
+++ b/app/models/forms/bulk_upload_sales/checking_file.rb
@@ -6,13 +6,18 @@ module Forms
       include Rails.application.routes.url_helpers
 
       attribute :year, :integer
+      attribute :organisation_id, :integer
 
       def view_path
         "bulk_upload_sales_logs/forms/checking_file"
       end
 
       def back_path
-        bulk_upload_sales_log_path(id: "start")
+        if organisation_id.present?
+          sales_logs_organisation_path(organisation_id)
+        else
+          bulk_upload_sales_log_path(id: "start")
+        end
       end
 
       def year_combo
diff --git a/app/models/forms/bulk_upload_sales/guidance.rb b/app/models/forms/bulk_upload_sales/guidance.rb
index 28ca6c3b5..ef792a3e4 100644
--- a/app/models/forms/bulk_upload_sales/guidance.rb
+++ b/app/models/forms/bulk_upload_sales/guidance.rb
@@ -7,6 +7,7 @@ module Forms
 
       attribute :year, :integer
       attribute :referrer
+      attribute :organisation_id, :integer
 
       def view_path
         "bulk_upload_shared/guidance"
@@ -15,7 +16,7 @@ module Forms
       def back_path
         case referrer
         when "prepare-your-file"
-          bulk_upload_sales_log_path(id: "prepare-your-file", form: { year: })
+          bulk_upload_sales_log_path(id: "prepare-your-file", form: { year:, organisation_id: }.compact)
         when "home"
           root_path
         else
diff --git a/app/models/forms/bulk_upload_sales/prepare_your_file.rb b/app/models/forms/bulk_upload_sales/prepare_your_file.rb
index 387f6239f..4bf0797a8 100644
--- a/app/models/forms/bulk_upload_sales/prepare_your_file.rb
+++ b/app/models/forms/bulk_upload_sales/prepare_your_file.rb
@@ -6,6 +6,7 @@ module Forms
       include Rails.application.routes.url_helpers
 
       attribute :year, :integer
+      attribute :organisation_id, :integer
 
       def view_path
         case year
@@ -18,14 +19,16 @@ module Forms
 
       def back_path
         if have_choice_of_year?
-          Rails.application.routes.url_helpers.bulk_upload_sales_log_path(id: "year", form: { year: })
+          Rails.application.routes.url_helpers.bulk_upload_sales_log_path(id: "year", form: { year: }.compact)
+        elsif organisation_id.present?
+          sales_logs_organisation_path(organisation_id)
         else
           Rails.application.routes.url_helpers.sales_logs_path
         end
       end
 
       def next_path
-        bulk_upload_sales_log_path(id: "upload-your-file", form: { year: })
+        bulk_upload_sales_log_path(id: "upload-your-file", form: { year:, organisation_id: }.compact)
       end
 
       def legacy_template_path
diff --git a/app/models/forms/bulk_upload_sales/upload_your_file.rb b/app/models/forms/bulk_upload_sales/upload_your_file.rb
index de650c831..5a0114caf 100644
--- a/app/models/forms/bulk_upload_sales/upload_your_file.rb
+++ b/app/models/forms/bulk_upload_sales/upload_your_file.rb
@@ -10,6 +10,7 @@ module Forms
       attribute :year, :integer
       attribute :file
       attribute :current_user
+      attribute :organisation_id, :integer
 
       validates :file, presence: true
       validate :validate_file_is_csv
@@ -19,7 +20,7 @@ module Forms
       end
 
       def back_path
-        bulk_upload_sales_log_path(id: "prepare-your-file", form: { year: })
+        bulk_upload_sales_log_path(id: "prepare-your-file", form: { year:, organisation_id: }.compact)
       end
 
       def year_combo
@@ -27,7 +28,7 @@ module Forms
       end
 
       def next_path
-        bulk_upload_sales_log_path(id: "checking-file", form: { year: })
+        bulk_upload_sales_log_path(id: "checking-file", form: { year:, organisation_id: }.compact)
       end
 
       def save!
@@ -36,6 +37,7 @@ module Forms
           log_type: BulkUpload.log_types[:sales],
           year:,
           filename: file.original_filename,
+          organisation_id: (organisation_id if current_user.support?) || current_user.organisation_id,
         )
 
         storage_service.write_file(bulk_upload.identifier, File.read(file.path))
diff --git a/app/models/forms/bulk_upload_sales/year.rb b/app/models/forms/bulk_upload_sales/year.rb
index 85959c4e5..1de8dec04 100644
--- a/app/models/forms/bulk_upload_sales/year.rb
+++ b/app/models/forms/bulk_upload_sales/year.rb
@@ -6,6 +6,7 @@ module Forms
       include Rails.application.routes.url_helpers
 
       attribute :year, :integer
+      attribute :organisation_id, :integer
 
       validates :year, presence: true
 
@@ -20,11 +21,15 @@ module Forms
       end
 
       def back_path
-        sales_logs_path
+        if organisation_id.present?
+          sales_logs_organisation_path(organisation_id)
+        else
+          sales_logs_path
+        end
       end
 
       def next_path
-        bulk_upload_sales_log_path(id: "prepare-your-file", form: { year: })
+        bulk_upload_sales_log_path(id: "prepare-your-file", form: { year:, organisation_id: }.compact)
       end
 
       def save!
diff --git a/app/models/location.rb b/app/models/location.rb
index 19cf5e211..03af24a94 100644
--- a/app/models/location.rb
+++ b/app/models/location.rb
@@ -121,6 +121,30 @@ class Location < ApplicationRecord
 
   scope :visible, -> { where(discarded_at: nil) }
 
+  scope :duplicate_sets, lambda {
+    scope = visible
+    .group(*DUPLICATE_LOCATION_ATTRIBUTES)
+    .where.not(scheme_id: nil)
+    .where.not(postcode: nil)
+    .where.not(mobility_type: nil)
+    .having(
+      "COUNT(*) > 1",
+    )
+    scope.pluck("ARRAY_AGG(id)")
+  }
+
+  scope :duplicate_sets_within_given_schemes, lambda {
+    scope = visible
+    .group(*DUPLICATE_LOCATION_ATTRIBUTES - %w[scheme_id])
+    .where.not(postcode: nil)
+    .where.not(mobility_type: nil)
+    .having(
+      "COUNT(*) > 1",
+    )
+    scope.pluck("ARRAY_AGG(id)")
+  }
+
+  DUPLICATE_LOCATION_ATTRIBUTES = %w[scheme_id postcode mobility_type].freeze
   LOCAL_AUTHORITIES = LocalAuthority.all.map { |la| [la.name, la.code] }.to_h
 
   enum local_authorities: LOCAL_AUTHORITIES
diff --git a/app/models/scheme.rb b/app/models/scheme.rb
index 6d3524723..2c73acc06 100644
--- a/app/models/scheme.rb
+++ b/app/models/scheme.rb
@@ -103,6 +103,22 @@ class Scheme < ApplicationRecord
 
   scope :visible, -> { where(discarded_at: nil) }
 
+  scope :duplicate_sets, lambda {
+    scope = visible
+    .group(*DUPLICATE_SCHEME_ATTRIBUTES)
+    .where.not(scheme_type: nil)
+    .where.not(registered_under_care_act: nil)
+    .where.not(primary_client_group: nil)
+    .where.not(has_other_client_group: nil)
+    .where.not(secondary_client_group: nil).or(where(has_other_client_group: 0))
+    .where.not(support_type: nil)
+    .where.not(intended_stay: nil)
+    .having(
+      "COUNT(*) > 1",
+    )
+    scope.pluck("ARRAY_AGG(id)")
+  }
+
   validate :validate_confirmed
   validate :validate_owning_organisation
 
@@ -192,6 +208,8 @@ class Scheme < ApplicationRecord
     "Missing": "X",
   }.freeze
 
+  DUPLICATE_SCHEME_ATTRIBUTES = %w[scheme_type registered_under_care_act primary_client_group secondary_client_group has_other_client_group support_type intended_stay].freeze
+
   enum arrangement_type: ARRANGEMENT_TYPE, _suffix: true
 
   def self.find_by_id_on_multiple_fields(scheme_id, location_id)
diff --git a/app/services/bulk_upload/lettings/year2024/row_parser.rb b/app/services/bulk_upload/lettings/year2024/row_parser.rb
index 8fc913055..dc0b2dca3 100644
--- a/app/services/bulk_upload/lettings/year2024/row_parser.rb
+++ b/app/services/bulk_upload/lettings/year2024/row_parser.rb
@@ -432,6 +432,7 @@ class BulkUpload::Lettings::Year2024::RowParser
 
   validate :validate_assigned_to_exists, on: :after_log
   validate :validate_assigned_to_related, on: :after_log
+  validate :validate_assigned_to_when_support, on: :after_log
   validate :validate_all_charges_given, on: :after_log, if: proc { is_carehome.zero? }
 
   validate :validate_address_option_found, on: :after_log, unless: -> { supported_housing? }
@@ -582,6 +583,12 @@ private
     end
   end
 
+  def validate_assigned_to_when_support
+    if field_3.blank? && bulk_upload.user.support?
+      errors.add(:field_3, category: :setup, message: I18n.t("validations.not_answered", question: "what is the CORE username of the account this letting log should be assigned to?"))
+    end
+  end
+
   def validate_assigned_to_related
     return unless assigned_to
     return if assigned_to.organisation == owning_organisation || assigned_to.organisation == managing_organisation
@@ -891,12 +898,17 @@ private
   end
 
   def validate_owning_org_permitted
-    if owning_organisation && !bulk_upload.user.organisation.affiliated_stock_owners.include?(owning_organisation)
-      block_log_creation!
+    return unless owning_organisation
+    return if bulk_upload_organisation.affiliated_stock_owners.include?(owning_organisation)
 
-      if errors[:field_1].blank?
-        errors.add(:field_1, "You do not have permission to add logs for this owning organisation", category: :setup)
-      end
+    block_log_creation!
+
+    return if errors[:field_1].present?
+
+    if bulk_upload.user.support?
+      errors.add(:field_1, "This owning organisation is not affiliated with #{bulk_upload_organisation.name}", category: :setup)
+    else
+      errors.add(:field_1, "You do not have permission to add logs for this owning organisation", category: :setup)
     end
   end
 
@@ -1137,7 +1149,7 @@ private
     attributes["renewal"] = renewal
     attributes["scheme"] = scheme
     attributes["location"] = location
-    attributes["assigned_to"] = assigned_to || bulk_upload.user
+    attributes["assigned_to"] = assigned_to || (bulk_upload.user.support? ? nil : bulk_upload.user)
     attributes["created_by"] = bulk_upload.user
     attributes["needstype"] = field_4
     attributes["rent_type"] = RENT_TYPE_BU_MAPPING[field_11]
@@ -1625,4 +1637,8 @@ private
   def reason_is_other?
     field_98 == 20
   end
+
+  def bulk_upload_organisation
+    Organisation.find(bulk_upload.organisation_id)
+  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 8be08d62f..0b7a70c27 100644
--- a/app/services/bulk_upload/sales/year2024/row_parser.rb
+++ b/app/services/bulk_upload/sales/year2024/row_parser.rb
@@ -462,6 +462,7 @@ class BulkUpload::Sales::Year2024::RowParser
 
   validate :validate_assigned_to_exists, on: :after_log
   validate :validate_assigned_to_related, on: :after_log
+  validate :validate_assigned_to_when_support, on: :after_log
   validate :validate_managing_org_related, on: :after_log
   validate :validate_relevant_collection_window, on: :after_log
   validate :validate_incomplete_soft_validations, on: :after_log
@@ -925,7 +926,7 @@ private
 
     attributes["owning_organisation"] = owning_organisation
     attributes["managing_organisation"] = managing_organisation
-    attributes["assigned_to"] = assigned_to || bulk_upload.user
+    attributes["assigned_to"] = assigned_to || (bulk_upload.user.support? ? nil : bulk_upload.user)
     attributes["created_by"] = bulk_upload.user
     attributes["hhregres"] = field_72
     attributes["hhregresstill"] = field_73
@@ -1302,12 +1303,17 @@ private
   end
 
   def validate_owning_org_permitted
-    if owning_organisation && !bulk_upload.user.organisation.affiliated_stock_owners.include?(owning_organisation)
-      block_log_creation!
+    return unless owning_organisation
+    return if bulk_upload_organisation.affiliated_stock_owners.include?(owning_organisation)
 
-      if errors[:field_1].blank?
-        errors.add(:field_1, "You do not have permission to add logs for this owning organisation", category: :setup)
-      end
+    block_log_creation!
+
+    return if errors[:field_1].present?
+
+    if bulk_upload.user.support?
+      errors.add(:field_1, "This owning organisation is not affiliated with #{bulk_upload_organisation.name}", category: :setup)
+    else
+      errors.add(:field_1, "You do not have permission to add logs for this owning organisation", category: :setup)
     end
   end
 
@@ -1319,6 +1325,12 @@ private
     end
   end
 
+  def validate_assigned_to_when_support
+    if field_3.blank? && bulk_upload.user.support?
+      errors.add(:field_3, category: :setup, message: I18n.t("validations.not_answered", question: "what is the CORE username of the account this sales log should be assigned to?"))
+    end
+  end
+
   def validate_assigned_to_related
     return unless assigned_to
     return if assigned_to.organisation == owning_organisation || assigned_to.organisation == managing_organisation
@@ -1492,4 +1504,8 @@ private
   def valid_nationality_options
     %w[0] + GlobalConstants::COUNTRIES_ANSWER_OPTIONS.keys # 0 is "Prefers not to say"
   end
+
+  def bulk_upload_organisation
+    Organisation.find(bulk_upload.organisation_id)
+  end
 end
diff --git a/app/views/bulk_upload_lettings_logs/forms/checking_file.html.erb b/app/views/bulk_upload_lettings_logs/forms/checking_file.html.erb
index 7524072a5..2e6d4cd10 100644
--- a/app/views/bulk_upload_lettings_logs/forms/checking_file.html.erb
+++ b/app/views/bulk_upload_lettings_logs/forms/checking_file.html.erb
@@ -6,6 +6,7 @@
   <div class="govuk-grid-column-two-thirds">
     <%= form_with model: @form, scope: :form, url: bulk_upload_lettings_log_path(id: "prepare-your-file"), method: :patch do |f| %>
       <%= f.hidden_field :year %>
+      <%= f.hidden_field :organisation_id %>
 
       <span class="govuk-caption-l">Upload lettings logs in bulk (<%= @form.year_combo %>)</span>
       <h1 class="govuk-heading-l">We’re checking the file</h1>
diff --git a/app/views/bulk_upload_lettings_logs/forms/needstype.erb b/app/views/bulk_upload_lettings_logs/forms/needstype.erb
index 6deec7e1d..644dd9f5f 100644
--- a/app/views/bulk_upload_lettings_logs/forms/needstype.erb
+++ b/app/views/bulk_upload_lettings_logs/forms/needstype.erb
@@ -7,6 +7,7 @@
     <%= form_with model: @form, scope: :form, url: bulk_upload_lettings_log_path(id: "needstype"), method: :patch do |f| %>
       <%= f.govuk_error_summary %>
       <%= f.hidden_field :year %>
+      <%= f.hidden_field :organisation_id %>
 
       <%= f.govuk_collection_radio_buttons :needstype,
             @form.options,
diff --git a/app/views/bulk_upload_lettings_logs/forms/prepare_your_file_2024.html.erb b/app/views/bulk_upload_lettings_logs/forms/prepare_your_file_2024.html.erb
index 45ce4b385..7657396f1 100644
--- a/app/views/bulk_upload_lettings_logs/forms/prepare_your_file_2024.html.erb
+++ b/app/views/bulk_upload_lettings_logs/forms/prepare_your_file_2024.html.erb
@@ -6,6 +6,7 @@
   <div class="govuk-grid-column-two-thirds">
     <%= form_with model: @form, scope: :form, url: bulk_upload_lettings_log_path(id: "prepare-your-file"), method: :patch do |f| %>
       <%= f.hidden_field :year %>
+      <%= f.hidden_field :organisation_id %>
 
       <span class="govuk-caption-l">Upload lettings logs in bulk (<%= @form.year_combo %>)</span>
       <h1 class="govuk-heading-l">Prepare your file</h1>
diff --git a/app/views/bulk_upload_lettings_logs/forms/upload_your_file.html.erb b/app/views/bulk_upload_lettings_logs/forms/upload_your_file.html.erb
index bbafc28b3..2814eb1ea 100644
--- a/app/views/bulk_upload_lettings_logs/forms/upload_your_file.html.erb
+++ b/app/views/bulk_upload_lettings_logs/forms/upload_your_file.html.erb
@@ -7,6 +7,7 @@
     <%= form_with model: @form, scope: :form, url: bulk_upload_lettings_log_path(id: "upload-your-file"), method: :patch do |f| %>
       <%= f.hidden_field :year %>
       <%= f.hidden_field :needstype %>
+      <%= f.hidden_field :organisation_id %>
 
       <%= f.govuk_error_summary %>
 
diff --git a/app/views/bulk_upload_lettings_logs/forms/year.html.erb b/app/views/bulk_upload_lettings_logs/forms/year.html.erb
index 8ba1c280f..4fef16dd7 100644
--- a/app/views/bulk_upload_lettings_logs/forms/year.html.erb
+++ b/app/views/bulk_upload_lettings_logs/forms/year.html.erb
@@ -4,6 +4,7 @@
 
 <%= form_with model: @form, scope: :form, url: bulk_upload_lettings_log_path(id: "year"), method: :patch do |f| %>
   <%= f.govuk_error_summary %>
+  <%= f.hidden_field :organisation_id %>
 
   <%= f.govuk_collection_radio_buttons :year,
         @form.options,
diff --git a/app/views/bulk_upload_lettings_results/show.html.erb b/app/views/bulk_upload_lettings_results/show.html.erb
index 30a6fd585..15c486b91 100644
--- a/app/views/bulk_upload_lettings_results/show.html.erb
+++ b/app/views/bulk_upload_lettings_results/show.html.erb
@@ -25,4 +25,4 @@
   </div>
 </div>
 
-<%= govuk_button_link_to "Upload your file again", start_bulk_upload_lettings_logs_path %>
+<%= govuk_button_link_to "Upload your file again", start_bulk_upload_lettings_logs_path(organisation_id: @bulk_upload.organisation_id) %>
diff --git a/app/views/bulk_upload_lettings_results/summary.html.erb b/app/views/bulk_upload_lettings_results/summary.html.erb
index b144793bf..8a59e8999 100644
--- a/app/views/bulk_upload_lettings_results/summary.html.erb
+++ b/app/views/bulk_upload_lettings_results/summary.html.erb
@@ -29,4 +29,4 @@
   <% end %>
 </div>
 
-<%= govuk_button_link_to "Upload your file again", start_bulk_upload_lettings_logs_path %>
+<%= govuk_button_link_to "Upload your file again", start_bulk_upload_lettings_logs_path(organisation_id: @bulk_upload.organisation_id) %>
diff --git a/app/views/bulk_upload_sales_logs/forms/checking_file.html.erb b/app/views/bulk_upload_sales_logs/forms/checking_file.html.erb
index c47a97d5e..8bcef5cad 100644
--- a/app/views/bulk_upload_sales_logs/forms/checking_file.html.erb
+++ b/app/views/bulk_upload_sales_logs/forms/checking_file.html.erb
@@ -6,6 +6,7 @@
   <div class="govuk-grid-column-two-thirds">
     <%= form_with model: @form, scope: :form, url: bulk_upload_sales_log_path(id: "prepare-your-file"), method: :patch do |f| %>
       <%= f.hidden_field :year %>
+      <%= f.hidden_field :organisation_id %><%= f.hidden_field :organisation_id %>
 
       <span class="govuk-caption-l">Upload sales logs in bulk (<%= @form.year_combo %>)</span>
       <h1 class="govuk-heading-l">We’re checking the file</h1>
diff --git a/app/views/bulk_upload_sales_logs/forms/prepare_your_file_2024.html.erb b/app/views/bulk_upload_sales_logs/forms/prepare_your_file_2024.html.erb
index 81c947e15..2a64de689 100644
--- a/app/views/bulk_upload_sales_logs/forms/prepare_your_file_2024.html.erb
+++ b/app/views/bulk_upload_sales_logs/forms/prepare_your_file_2024.html.erb
@@ -6,6 +6,7 @@
   <div class="govuk-grid-column-two-thirds">
     <%= form_with model: @form, scope: :form, url: bulk_upload_sales_log_path(id: "prepare-your-file"), method: :patch do |f| %>
       <%= f.hidden_field :year %>
+      <%= f.hidden_field :organisation_id %>
 
       <span class="govuk-caption-l">Upload sales logs in bulk (<%= @form.year_combo %>)</span>
       <h1 class="govuk-heading-l">Prepare your file</h1>
diff --git a/app/views/bulk_upload_sales_logs/forms/upload_your_file.html.erb b/app/views/bulk_upload_sales_logs/forms/upload_your_file.html.erb
index 36e7240dc..75350ae9e 100644
--- a/app/views/bulk_upload_sales_logs/forms/upload_your_file.html.erb
+++ b/app/views/bulk_upload_sales_logs/forms/upload_your_file.html.erb
@@ -6,6 +6,7 @@
   <div class="govuk-grid-column-two-thirds">
     <%= form_with model: @form, scope: :form, url: bulk_upload_sales_log_path(id: "upload-your-file"), method: :patch do |f| %>
       <%= f.hidden_field :year %>
+      <%= f.hidden_field :organisation_id %>
 
       <%= f.govuk_error_summary %>
 
diff --git a/app/views/bulk_upload_sales_logs/forms/year.html.erb b/app/views/bulk_upload_sales_logs/forms/year.html.erb
index d8aa09172..2aaa7c0f8 100644
--- a/app/views/bulk_upload_sales_logs/forms/year.html.erb
+++ b/app/views/bulk_upload_sales_logs/forms/year.html.erb
@@ -4,6 +4,7 @@
 
 <%= form_with model: @form, scope: :form, url: bulk_upload_sales_log_path(id: "year"), method: :patch do |f| %>
   <%= f.govuk_error_summary %>
+  <%= f.hidden_field :organisation_id %>
 
   <%= f.govuk_collection_radio_buttons :year,
         @form.options,
diff --git a/app/views/bulk_upload_sales_results/show.html.erb b/app/views/bulk_upload_sales_results/show.html.erb
index 0d645db33..776fdfa2f 100644
--- a/app/views/bulk_upload_sales_results/show.html.erb
+++ b/app/views/bulk_upload_sales_results/show.html.erb
@@ -25,4 +25,4 @@
   </div>
 </div>
 
-<%= govuk_button_link_to "Upload your file again", start_bulk_upload_sales_logs_path %>
+<%= govuk_button_link_to "Upload your file again", start_bulk_upload_sales_logs_path(organisation_id: @bulk_upload.organisation_id) %>
diff --git a/app/views/bulk_upload_sales_results/summary.html.erb b/app/views/bulk_upload_sales_results/summary.html.erb
index 0fa51b9dc..0e423621d 100644
--- a/app/views/bulk_upload_sales_results/summary.html.erb
+++ b/app/views/bulk_upload_sales_results/summary.html.erb
@@ -29,4 +29,4 @@
   <% end %>
 </div>
 
-<%= govuk_button_link_to "Upload your file again", start_bulk_upload_sales_logs_path %>
+<%= govuk_button_link_to "Upload your file again", start_bulk_upload_sales_logs_path(organisation_id: @bulk_upload.organisation_id) %>
diff --git a/app/views/logs/_create_for_org_actions.html.erb b/app/views/logs/_create_for_org_actions.html.erb
index f6ed9ad82..0564e678a 100644
--- a/app/views/logs/_create_for_org_actions.html.erb
+++ b/app/views/logs/_create_for_org_actions.html.erb
@@ -1,10 +1,12 @@
 <div class="govuk-button-group app-filter-toggle">
   <% if @organisation.data_protection_confirmed? %>
     <% if current_page?(controller: 'organisations', action: 'lettings_logs') %>
-      <%= govuk_button_to "Create a new lettings log for this organisation", lettings_logs_path(lettings_log: { owning_organisation_id: @organisation.id }, method: :post) %>
-    <% end %>
+      <%= govuk_button_to "Create a new lettings log for this organisation", lettings_logs_path(lettings_log: { owning_organisation_id: @organisation.id }, method: :post), class: "govuk-!-margin-right-6" %>
+      <%= govuk_button_link_to "Upload lettings logs in bulk", bulk_upload_lettings_log_path(id: "start", organisation_id: @organisation.id), secondary: true %>
+<% end %>
     <% if current_page?(controller: 'organisations', action: 'sales_logs') %>
-      <%= govuk_button_to "Create a new sales log for this organisation", sales_logs_path(sales_log: { owning_organisation_id: @organisation.id }, method: :post) %>
-    <% end %>
+      <%= govuk_button_to "Create a new sales log for this organisation", sales_logs_path(sales_log: { owning_organisation_id: @organisation.id }, method: :post), class: "govuk-!-margin-right-6" %>
+      <%= govuk_button_link_to "Upload sales logs in bulk", bulk_upload_sales_log_path(id: "start", organisation_id: @organisation.id), secondary: true %>
+<% end %>
   <% end %>
 </div>
diff --git a/app/views/schemes/index.html.erb b/app/views/schemes/index.html.erb
index d0ae44072..edaed6212 100644
--- a/app/views/schemes/index.html.erb
+++ b/app/views/schemes/index.html.erb
@@ -6,7 +6,9 @@
 <%= render partial: "organisations/headings", locals: current_user.support? ? { main: "Supported housing schemes", sub: nil } : { main: "Supported housing schemes", sub: current_user.organisation.name } %>
 
 <% if SchemePolicy.new(current_user, nil).create? %>
-  <%= govuk_button_link_to "Create a new supported housing scheme", new_scheme_path, html: { method: :post } %>
+  <div class="govuk-button-group govuk-!-margin-bottom-6">
+    <%= govuk_button_link_to "Create a new supported housing scheme", new_scheme_path, html: { method: :post } %>
+  </div>
 <% end %>
 <div class="app-filter-layout" data-controller="filter-layout">
   <%= render partial: "schemes/scheme_filters" %>
diff --git a/app/views/users/index.html.erb b/app/views/users/index.html.erb
index 7da3deda1..4e5053563 100644
--- a/app/views/users/index.html.erb
+++ b/app/views/users/index.html.erb
@@ -6,7 +6,9 @@
 <%= render partial: "organisations/headings", locals: current_user.support? ? { main: "Users", sub: nil } : { main: "Users", sub: current_user.organisation.name } %>
 
 <% if current_user.data_coordinator? || current_user.support? %>
-  <%= govuk_button_link_to "Invite user", new_user_path, html: { method: :get } %>
+  <div class="govuk-button-group govuk-!-margin-bottom-6">
+    <%= govuk_button_link_to "Invite user", new_user_path, html: { method: :get } %>
+  </div>
 <% end %>
 <div class="app-filter-layout" data-controller="filter-layout">
   <%= render partial: "users/user_filters" %>
diff --git a/db/migrate/20240905092332_add_organisation_id_to_bulk_uploads.rb b/db/migrate/20240905092332_add_organisation_id_to_bulk_uploads.rb
new file mode 100644
index 000000000..d9f4f16da
--- /dev/null
+++ b/db/migrate/20240905092332_add_organisation_id_to_bulk_uploads.rb
@@ -0,0 +1,5 @@
+class AddOrganisationIdToBulkUploads < ActiveRecord::Migration[7.0]
+  def change
+    add_column :bulk_uploads, :organisation_id, :integer
+  end
+end
diff --git a/db/migrate/20240923145326_add_validation_checked_field.rb b/db/migrate/20240923145326_add_validation_checked_field.rb
new file mode 100644
index 000000000..899992974
--- /dev/null
+++ b/db/migrate/20240923145326_add_validation_checked_field.rb
@@ -0,0 +1,5 @@
+class AddValidationCheckedField < ActiveRecord::Migration[7.0]
+  def change
+    add_column :log_validations, :checked, :boolean
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 80463eaad..4d6f18b84 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.0].define(version: 2024_09_18_112702) do
+ActiveRecord::Schema[7.0].define(version: 2024_09_23_145326) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
 
@@ -42,6 +42,7 @@ ActiveRecord::Schema[7.0].define(version: 2024_09_18_112702) do
     t.text "choice"
     t.integer "total_logs_count"
     t.string "rent_type_fix_status", default: "not_applied"
+    t.integer "organisation_id"
     t.integer "moved_user_id"
     t.index ["identifier"], name: "index_bulk_uploads_on_identifier", unique: true
     t.index ["user_id"], name: "index_bulk_uploads_on_user_id"
@@ -410,6 +411,7 @@ ActiveRecord::Schema[7.0].define(version: 2024_09_18_112702) do
     t.string "other_validated_models"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
+    t.boolean "checked"
   end
 
   create_table "logs_exports", force: :cascade do |t|
diff --git a/lib/tasks/count_duplicates.rake b/lib/tasks/count_duplicates.rake
new file mode 100644
index 000000000..e65688b4d
--- /dev/null
+++ b/lib/tasks/count_duplicates.rake
@@ -0,0 +1,63 @@
+namespace :count_duplicates do
+  desc "Count the number of duplicate schemes per organisation"
+  task scheme_duplicates_per_org: :environment do
+    duplicates_csv = CSV.generate(headers: true) do |csv|
+      csv << ["Organisation id", "Number of duplicate sets", "Total duplicate schemes"]
+
+      Organisation.visible.each do |organisation|
+        if organisation.owned_schemes.duplicate_sets.count.positive?
+          csv << [organisation.id, organisation.owned_schemes.duplicate_sets.count, organisation.owned_schemes.duplicate_sets.sum(&:size)]
+        end
+      end
+    end
+
+    filename = "scheme-duplicates-#{Time.zone.now}.csv"
+    storage_service = Storage::S3Service.new(Configuration::EnvConfigurationService.new, ENV["BULK_UPLOAD_BUCKET"])
+    storage_service.write_file(filename, "#{duplicates_csv}")
+
+    url = storage_service.get_presigned_url(filename, 72.hours.to_i)
+    Rails.logger.info("Download URL: #{url}")
+  end
+
+  desc "Count the number of duplicate locations per organisation"
+  task location_duplicates_per_org: :environment do
+    duplicates_csv = CSV.generate(headers: true) do |csv|
+      csv << ["Organisation id", "Duplicate sets within individual schemes", "Duplicate locations within individual schemes", "All duplicate sets", "All duplicates"]
+
+      Organisation.visible.each do |organisation|
+        duplicate_sets_within_individual_schemes = []
+
+        organisation.owned_schemes.each do |scheme|
+          duplicate_sets_within_individual_schemes += scheme.locations.duplicate_sets
+        end
+        duplicate_locations_within_individual_schemes = duplicate_sets_within_individual_schemes.flatten
+
+        duplicate_sets_within_duplicate_schemes = []
+        if organisation.owned_schemes.duplicate_sets.count.positive?
+          organisation.owned_schemes.duplicate_sets.each do |duplicate_set|
+            duplicate_sets_within_duplicate_schemes += Location.where(scheme_id: duplicate_set).duplicate_sets_within_given_schemes
+          end
+          duplicate_locations_within_duplicate_schemes_ids = duplicate_sets_within_duplicate_schemes.flatten
+
+          duplicate_sets_within_individual_schemes_without_intersecting_sets = duplicate_sets_within_individual_schemes.reject { |set| set.any? { |id| duplicate_sets_within_duplicate_schemes.any? { |duplicate_set| duplicate_set.include?(id) } } }
+          all_duplicate_sets_count = (duplicate_sets_within_individual_schemes_without_intersecting_sets + duplicate_sets_within_duplicate_schemes).count
+          all_duplicate_locations_count = (duplicate_locations_within_duplicate_schemes_ids + duplicate_locations_within_individual_schemes).uniq.count
+        else
+          all_duplicate_sets_count = duplicate_sets_within_individual_schemes.count
+          all_duplicate_locations_count = duplicate_locations_within_individual_schemes.count
+        end
+
+        if all_duplicate_locations_count.positive?
+          csv << [organisation.id, duplicate_sets_within_individual_schemes.count, duplicate_locations_within_individual_schemes.count, all_duplicate_sets_count, all_duplicate_locations_count]
+        end
+      end
+    end
+
+    filename = "location-duplicates-#{Time.zone.now}.csv"
+    storage_service = Storage::S3Service.new(Configuration::EnvConfigurationService.new, ENV["BULK_UPLOAD_BUCKET"])
+    storage_service.write_file(filename, "#{duplicates_csv}")
+
+    url = storage_service.get_presigned_url(filename, 72.hours.to_i)
+    Rails.logger.info("Download URL: #{url}")
+  end
+end
diff --git a/lib/tasks/performance_test.sh b/lib/tasks/performance_test.sh
new file mode 100644
index 000000000..6fdc4248a
--- /dev/null
+++ b/lib/tasks/performance_test.sh
@@ -0,0 +1,124 @@
+cd performance_test
+
+# Lettings logs page
+echo "Get token"
+TOKEN=$(curl -c token_cookies.txt -s https://staging.submit-social-housing-data.levellingup.gov.uk/account/sign-in | grep '<meta name="csrf-token"' | sed -n 's/.*content="\([^"]*\)".*/\1/p')
+
+echo "Logging in..."
+echo $email
+curl -L -o nul -c login_cookies.txt -b token_cookies.txt -X POST https://staging.submit-social-housing-data.levellingup.gov.uk/account/sign-in \
+  -d "user[email]=$email" \
+  -d "user[password]=$password" \
+  -d "authenticity_token=$TOKEN"
+
+COOKIES=$(awk '/_data_collector_session/ { print $6, $7 }' login_cookies.txt | tr ' ' '=')
+
+echo "Running lettings logs page performance test..."
+ab -n 50 -c 50 -l -C "$COOKIES" 'https://staging.submit-social-housing-data.levellingup.gov.uk/lettings-logs?years[]=2024&status[]=completed' > performance_lettings_test_results.txt
+file="performance_lettings_test_results.txt"
+
+failed_requests=$(grep "Failed requests:" "$file" | awk '{print $3}')
+non_2xx_responses=$(grep "Non-2xx responses:" "$file" | awk '{print $3}')
+time_per_request_all=$(grep "Time per request:" "$file" | awk 'NR==2{print $4}')
+requests_per_second=$(grep "Requests per second:" "$file" | awk '{print $4}')
+
+
+if [ "$failed_requests" -gt 0 ]; then
+  echo "Lettings logs: Performance test failed - $failed_requests failed requests"
+  exit 1
+fi
+
+if [ "$non_2xx_responses" -ne 0 ] && [ -n "$non_2xx_responses" ]; then
+  echo "Lettings logs: Performance test failed: There were $non_2xx_responses non-2xx responses."
+  exit 1
+fi
+
+if (( $(echo "$time_per_request_all > 250" | bc -l) )); then
+  echo "Lettings logs: Performance test failed - Time per request across all concurrent requests is more than 250 ms: $time_per_request_all ms"
+  exit 1
+fi
+
+if (( $(echo "$requests_per_second < 5" | bc -l) )); then
+  echo "Lettings logs: Performance test failed - Requests per second is less than 5: $requests_per_second"
+  exit 1
+fi
+
+echo "Lettings logs page test passed: No failed requests and no non-2xx responses."
+
+
+# Sales logs page
+echo "Running sales logs page performance test..."
+ab -n 50 -c 50 -l -C "$COOKIES" 'https://staging.submit-social-housing-data.levellingup.gov.uk/sales-logs?years[]=2024&status[]=completed' > performance_sales_test_results.txt
+file="performance_sales_test_results.txt"
+
+failed_requests=$(grep "Failed requests:" "$file" | awk '{print $3}')
+non_2xx_responses=$(grep "Non-2xx responses:" "$file" | awk '{print $3}')
+time_per_request_all=$(grep "Time per request:" "$file" | awk 'NR==2{print $4}')
+requests_per_second=$(grep "Requests per second:" "$file" | awk '{print $4}')
+
+
+if [ "$failed_requests" -gt 0 ]; then
+  echo "Sales logs: Performance test failed - $failed_requests failed requests"
+  exit 1
+fi
+
+if [ "$non_2xx_responses" -ne 0 ] && [ -n "$non_2xx_responses" ]; then
+  echo "Sales logs: Performance test failed: There were $non_2xx_responses non-2xx responses."
+  exit 1
+fi
+
+if (( $(echo "$time_per_request_all > 250" | bc -l) )); then
+  echo "Sales logs: Performance test failed - Time per request across all concurrent requests is more than 250 ms: $time_per_request_all ms"
+  exit 1
+fi
+
+if (( $(echo "$requests_per_second < 5" | bc -l) )); then
+  echo "Sales logs: Performance test failed - Requests per second is less than 5: $requests_per_second"
+  exit 1
+fi
+
+echo "Sales logs page test passed: No failed requests and no non-2xx responses."
+
+
+# Post data to a log test
+page_content=$(curl -b login_cookies.txt -s 'https://staging.submit-social-housing-data.levellingup.gov.uk/lettings-logs?years[]=2024&status[]=completed')
+completed_log_link=$(echo "$page_content" | sed -n 's/.*<a class="govuk-link" href="\([^"]*lettings-logs[^"]*\)".*/\1/p' | head -n 1)
+echo "testing post to $completed_log_link"
+
+TOKEN=$(curl -L -b login_cookies.txt -c login_cookies.txt https://staging.submit-social-housing-data.levellingup.gov.uk$completed_log_link/tenant-code | grep '<meta name="csrf-token"' | sed -n 's/.*content="\([^"]*\)".*/\1/p')
+
+COOKIES=$(awk '/_data_collector_session/ { print $6, $7 }' login_cookies.txt | tr ' ' '=')
+
+echo "lettings_log[tenancycode]=performance_test_tenancy_code&lettings_log[page]=tenant_code&authenticity_token=$TOKEN" > post_data.txt
+
+ab -n 50 -c 50 -l -T application/x-www-form-urlencoded \
+-H "X-CSRF-Token: $TOKEN" \
+-C "$COOKIES" \
+-p post_data.txt \
+"https://staging.submit-social-housing-data.levellingup.gov.uk$completed_log_link/tenant-code" > performance_post_test_results.txt
+
+file="performance_post_test_results.txt"
+failed_requests=$(grep "Failed requests:" "$file" | awk '{print $3}')
+time_per_request_all=$(grep "Time per request:" "$file" | awk 'NR==2{print $4}')
+requests_per_second=$(grep "Requests per second:" "$file" | awk '{print $4}')
+
+
+if [ "$failed_requests" -gt 0 ]; then
+  echo "Update logs: Performance test failed - $failed_requests failed requests"
+  exit 1
+fi
+
+if (( $(echo "$time_per_request_all > 500" | bc -l) )); then
+  echo "Update logs: Performance test failed - Time per request across all concurrent requests is more than 500 ms: $time_per_request_all ms"
+  exit 1
+fi
+
+if (( $(echo "$requests_per_second < 3" | bc -l) )); then
+  echo "Update logs: Performance test failed - Requests per second is less than 3: $requests_per_second"
+  exit 1
+fi
+
+echo "Update logs test passed: No failed requests and request times as expected."
+
+echo "All tests passed"
+exit 0
diff --git a/spec/factories/bulk_upload.rb b/spec/factories/bulk_upload.rb
index c848fb071..cefe95c2b 100644
--- a/spec/factories/bulk_upload.rb
+++ b/spec/factories/bulk_upload.rb
@@ -9,6 +9,7 @@ FactoryBot.define do
     sequence(:filename) { |n| "bulk-upload-#{n}.csv" }
     needstype { 1 }
     rent_type_fix_status { BulkUpload.rent_type_fix_statuses.values.sample }
+    organisation_id { user.organisation_id }
 
     trait(:sales) do
       log_type { BulkUpload.log_types[:sales] }
diff --git a/spec/factories/scheme.rb b/spec/factories/scheme.rb
index 7983bfa0a..5f4ad30bc 100644
--- a/spec/factories/scheme.rb
+++ b/spec/factories/scheme.rb
@@ -32,5 +32,14 @@ FactoryBot.define do
       confirmed { false }
       support_type { nil }
     end
+    trait :duplicate do
+      scheme_type { 4 }
+      registered_under_care_act { 1 }
+      primary_client_group { "O" }
+      secondary_client_group { "H" }
+      has_other_client_group { 1 }
+      support_type { 2 }
+      intended_stay { "M" }
+    end
   end
 end
diff --git a/spec/features/organisation_spec.rb b/spec/features/organisation_spec.rb
index 1867285eb..3d65cda87 100644
--- a/spec/features/organisation_spec.rb
+++ b/spec/features/organisation_spec.rb
@@ -139,6 +139,10 @@ RSpec.describe "User Features" do
         expect(page).to have_button("Create a new lettings log for this organisation")
       end
 
+      it "shows a upload lettings logs in bulk link" do
+        expect(page).to have_link("Upload lettings logs in bulk")
+      end
+
       context "when creating a log for that organisation" do
         it "pre-fills the value for owning organisation for that log" do
           click_button("Create a new lettings log for this organisation")
@@ -230,6 +234,10 @@ RSpec.describe "User Features" do
         expect(page).to have_button("Create a new sales log for this organisation")
       end
 
+      it "shows a upload sales logs in bulk link" do
+        expect(page).to have_link("Upload sales logs in bulk")
+      end
+
       context "when creating a log for that organisation" do
         it "pre-fills the value for owning organisation for that log" do
           click_button("Create a new sales log for this organisation")
diff --git a/spec/lib/tasks/count_duplicates_spec.rb b/spec/lib/tasks/count_duplicates_spec.rb
new file mode 100644
index 000000000..99da5b2fb
--- /dev/null
+++ b/spec/lib/tasks/count_duplicates_spec.rb
@@ -0,0 +1,111 @@
+require "rails_helper"
+require "rake"
+
+RSpec.describe "count_duplicates" do
+  before do
+    allow(Storage::S3Service).to receive(:new).and_return(storage_service)
+    allow(storage_service).to receive(:write_file)
+    allow(storage_service).to receive(:get_presigned_url).and_return(test_url)
+  end
+
+  describe "count_duplicates:scheme_duplicates_per_org", type: :task do
+    subject(:task) { Rake::Task["count_duplicates:scheme_duplicates_per_org"] }
+
+    let(:storage_service) { instance_double(Storage::S3Service) }
+    let(:test_url) { "test_url" }
+
+    before do
+      Rake.application.rake_require("tasks/count_duplicates")
+      Rake::Task.define_task(:environment)
+      task.reenable
+    end
+
+    context "when the rake task is run" do
+      context "and there are no duplicate schemes" do
+        before do
+          create(:organisation)
+        end
+
+        it "creates a csv with headers only" do
+          expect(storage_service).to receive(:write_file).with(/scheme-duplicates-.*\.csv/, "\uFEFFOrganisation id,Number of duplicate sets,Total duplicate schemes\n")
+          expect(Rails.logger).to receive(:info).with("Download URL: #{test_url}")
+          task.invoke
+        end
+      end
+
+      context "and there are duplicate schemes" do
+        let(:organisation) { create(:organisation) }
+        let(:organisation2) { create(:organisation) }
+
+        before do
+          create_list(:scheme, 2, :duplicate, owning_organisation: organisation)
+          create_list(:scheme, 3, :duplicate, primary_client_group: "I", owning_organisation: organisation)
+          create_list(:scheme, 5, :duplicate, owning_organisation: organisation2)
+        end
+
+        it "creates a csv with correct duplicate numbers" do
+          expect(storage_service).to receive(:write_file).with(/scheme-duplicates-.*\.csv/, "\uFEFFOrganisation id,Number of duplicate sets,Total duplicate schemes\n#{organisation.id},2,5\n#{organisation2.id},1,5\n")
+          expect(Rails.logger).to receive(:info).with("Download URL: #{test_url}")
+          task.invoke
+        end
+      end
+    end
+  end
+
+  describe "count_duplicates:location_duplicates_per_org", type: :task do
+    subject(:task) { Rake::Task["count_duplicates:location_duplicates_per_org"] }
+
+    let(:storage_service) { instance_double(Storage::S3Service) }
+    let(:test_url) { "test_url" }
+
+    before do
+      Rake.application.rake_require("tasks/count_duplicates")
+      Rake::Task.define_task(:environment)
+      task.reenable
+    end
+
+    context "when the rake task is run" do
+      context "and there are no duplicate locations" do
+        before do
+          create(:organisation)
+        end
+
+        it "creates a csv with headers only" do
+          expect(storage_service).to receive(:write_file).with(/location-duplicates-.*\.csv/, "\uFEFFOrganisation id,Duplicate sets within individual schemes,Duplicate locations within individual schemes,All duplicate sets,All duplicates\n")
+          expect(Rails.logger).to receive(:info).with("Download URL: #{test_url}")
+          task.invoke
+        end
+      end
+
+      context "and there are duplicate locations" do
+        let(:organisation) { create(:organisation) }
+        let(:scheme_a) { create(:scheme, :duplicate, owning_organisation: organisation) }
+        let(:scheme_b) { create(:scheme, :duplicate, owning_organisation: organisation) }
+        let(:scheme_c) { create(:scheme, owning_organisation: organisation) }
+        let(:organisation2) { create(:organisation) }
+        let(:scheme2) { create(:scheme, owning_organisation: organisation2) }
+        let(:scheme3) { create(:scheme, owning_organisation: organisation2) }
+
+        before do
+          create_list(:location, 2, postcode: "A1 1AB", mobility_type: "M", scheme: scheme_a) # Location A
+          create_list(:location, 1, postcode: "A1 1AB", mobility_type: "A", scheme: scheme_a) # Location B
+
+          create_list(:location, 1, postcode: "A1 1AB", mobility_type: "M", scheme: scheme_b) # Location A
+          create_list(:location, 1, postcode: "A1 1AB", mobility_type: "A", scheme: scheme_b) # Location B
+          create_list(:location, 2, postcode: "A1 1AB", mobility_type: "N", scheme: scheme_b) # Location C
+
+          create_list(:location, 2, postcode: "A1 1AB", mobility_type: "A", scheme: scheme_c) # Location B
+
+          create_list(:location, 5, postcode: "A1 1AB", mobility_type: "M", scheme: scheme2)
+          create_list(:location, 2, postcode: "A1 1AB", mobility_type: "M", scheme: scheme3)
+        end
+
+        it "creates a csv with correct duplicate numbers" do
+          expect(storage_service).to receive(:write_file).with(/location-duplicates-.*\.csv/, "\uFEFFOrganisation id,Duplicate sets within individual schemes,Duplicate locations within individual schemes,All duplicate sets,All duplicates\n#{organisation.id},3,6,4,9\n#{organisation2.id},2,7,2,7\n")
+          expect(Rails.logger).to receive(:info).with("Download URL: #{test_url}")
+          task.invoke
+        end
+      end
+    end
+  end
+end
diff --git a/spec/models/location_spec.rb b/spec/models/location_spec.rb
index 4856c5662..79265d361 100644
--- a/spec/models/location_spec.rb
+++ b/spec/models/location_spec.rb
@@ -831,6 +831,76 @@ RSpec.describe Location, type: :model do
         expect(described_class.active.count).to eq(2)
       end
     end
+
+    context "when getting list of duplicate locations" do
+      let!(:scheme) { create(:scheme) }
+      let!(:location) { create(:location, postcode: "AB1 2CD", mobility_type: "M", scheme:) }
+      let!(:duplicate_location) { create(:location, postcode: "AB1 2CD", mobility_type: "M", scheme:) }
+      let(:duplicate_sets) { described_class.duplicate_sets }
+
+      it "returns a list of duplicates for the same scheme" do
+        expect(duplicate_sets.count).to eq(1)
+        expect(duplicate_sets.first).to contain_exactly(location.id, duplicate_location.id)
+      end
+
+      context "when there is a deleted duplicate location" do
+        before do
+          create(:location, postcode: "AB1 2CD", mobility_type: "M", discarded_at: Time.zone.now, scheme:)
+        end
+
+        it "does not return the deleted location as a duplicate" do
+          expect(duplicate_sets.count).to eq(1)
+          expect(duplicate_sets.first).to contain_exactly(location.id, duplicate_location.id)
+        end
+      end
+
+      context "when there is a location with a different postcode" do
+        before do
+          create(:location, postcode: "A1 1AB", mobility_type: "M", scheme:)
+        end
+
+        it "does not return a location with a different postcode as a duplicate" do
+          expect(duplicate_sets.count).to eq(1)
+          expect(duplicate_sets.first).to contain_exactly(location.id, duplicate_location.id)
+        end
+      end
+
+      context "when there is a location with a different mobility_type" do
+        before do
+          create(:location, postcode: "AB1 2CD", mobility_type: "A", scheme:)
+        end
+
+        it "does not return a location with a different mobility_type as a duplicate" do
+          expect(duplicate_sets.count).to eq(1)
+          expect(duplicate_sets.first).to contain_exactly(location.id, duplicate_location.id)
+        end
+      end
+
+      context "when there is a location with a different scheme" do
+        before do
+          create(:location, postcode: "AB1 2CD", mobility_type: "M")
+        end
+
+        it "does not return a location with a different scheme as a duplicate" do
+          expect(duplicate_sets.count).to eq(1)
+          expect(duplicate_sets.first).to contain_exactly(location.id, duplicate_location.id)
+        end
+      end
+
+      context "when there is a location with nil values for duplicate check fields" do
+        before do
+          [location, duplicate_location].each do |l|
+            l.postcode = nil
+            l.mobility_type = nil
+            l.save!(validate: false)
+          end
+        end
+
+        it "does not return a location with nil values as a duplicate" do
+          expect(duplicate_sets).to be_empty
+        end
+      end
+    end
   end
 
   describe "status" do
diff --git a/spec/models/scheme_spec.rb b/spec/models/scheme_spec.rb
index 9b3db15a4..5ca529d3e 100644
--- a/spec/models/scheme_spec.rb
+++ b/spec/models/scheme_spec.rb
@@ -208,6 +208,135 @@ RSpec.describe Scheme, type: :model do
           end
         end
       end
+
+      context "when getting list of duplicate schemes" do
+        let(:organisation) { create(:organisation) }
+        let!(:scheme) { create(:scheme, :duplicate, owning_organisation: organisation) }
+        let!(:duplicate_scheme) { create(:scheme, :duplicate, owning_organisation: organisation) }
+        let(:duplicate_sets) { described_class.duplicate_sets }
+
+        it "returns a list of duplicates in the same organisation" do
+          expect(duplicate_sets.count).to eq(1)
+          expect(duplicate_sets.first).to contain_exactly(scheme.id, duplicate_scheme.id)
+        end
+
+        context "when there is a deleted duplicate scheme" do
+          before do
+            create(:scheme, :duplicate, discarded_at: Time.zone.now)
+          end
+
+          it "does not return the deleted scheme as a duplicate" do
+            expect(duplicate_sets.count).to eq(1)
+            expect(duplicate_sets.first).to contain_exactly(scheme.id, duplicate_scheme.id)
+          end
+        end
+
+        context "when there is a scheme with a different scheme_type" do
+          before do
+            create(:scheme, :duplicate, scheme_type: 7)
+          end
+
+          it "does not return a scheme with a different scheme_type as a duplicate" do
+            expect(duplicate_sets.count).to eq(1)
+            expect(duplicate_sets.first).to contain_exactly(scheme.id, duplicate_scheme.id)
+          end
+        end
+
+        context "when there is a scheme with a different registered_under_care_act" do
+          before do
+            create(:scheme, :duplicate, registered_under_care_act: 2)
+          end
+
+          it "does not return a scheme with a different registered_under_care_act as a duplicate" do
+            expect(duplicate_sets.count).to eq(1)
+            expect(duplicate_sets.first).to contain_exactly(scheme.id, duplicate_scheme.id)
+          end
+        end
+
+        context "when there is a scheme with a different primary_client_group" do
+          before do
+            create(:scheme, :duplicate, primary_client_group: "H")
+          end
+
+          it "does not return a scheme with a different primary_client_group as a duplicate" do
+            expect(duplicate_sets.count).to eq(1)
+            expect(duplicate_sets.first).to contain_exactly(scheme.id, duplicate_scheme.id)
+          end
+        end
+
+        context "when there is a scheme with a different secondary_client_group" do
+          before do
+            create(:scheme, :duplicate, secondary_client_group: "O")
+          end
+
+          it "does not return a scheme with a different secondary_client_group as a duplicate" do
+            expect(duplicate_sets.count).to eq(1)
+            expect(duplicate_sets.first).to contain_exactly(scheme.id, duplicate_scheme.id)
+          end
+        end
+
+        context "when there is a scheme with a different has_other_client_group" do
+          before do
+            create(:scheme, :duplicate, has_other_client_group: 0)
+          end
+
+          it "does not return a scheme with a different has_other_client_group as a duplicate" do
+            expect(duplicate_sets.count).to eq(1)
+            expect(duplicate_sets.first).to contain_exactly(scheme.id, duplicate_scheme.id)
+          end
+        end
+
+        context "when there is a scheme with a different support_type" do
+          before do
+            create(:scheme, :duplicate, support_type: 4)
+          end
+
+          it "does not return a scheme with a different support_type as a duplicate" do
+            expect(duplicate_sets.count).to eq(1)
+            expect(duplicate_sets.first).to contain_exactly(scheme.id, duplicate_scheme.id)
+          end
+        end
+
+        context "when there is a scheme with a different intended_stay" do
+          before do
+            create(:scheme, :duplicate, intended_stay: "P")
+          end
+
+          it "does not return a scheme with a different intended_stay as a duplicate" do
+            expect(duplicate_sets.count).to eq(1)
+            expect(duplicate_sets.first).to contain_exactly(scheme.id, duplicate_scheme.id)
+          end
+        end
+
+        context "when there is a scheme with nil values for duplicate check fields" do
+          before do
+            [scheme, duplicate_scheme].each do |s|
+              s.scheme_type = nil
+              s.registered_under_care_act = nil
+              s.primary_client_group = nil
+              s.secondary_client_group = nil
+              s.has_other_client_group = nil
+              s.support_type = nil
+              s.intended_stay = nil
+              s.save!(validate: false)
+            end
+          end
+
+          it "does not return a scheme with nil values as a duplicate" do
+            expect(duplicate_sets).to be_empty
+          end
+        end
+
+        context "when there are duplicate schemes without secondary client group" do
+          let!(:scheme) { create(:scheme, :duplicate, owning_organisation: organisation, secondary_client_group: nil, has_other_client_group: 0) }
+          let!(:duplicate_scheme) { create(:scheme, :duplicate, owning_organisation: organisation, secondary_client_group: nil, has_other_client_group: 0) }
+
+          it "does not returns the duplicates" do
+            expect(duplicate_sets.count).to eq(1)
+            expect(duplicate_sets.first).to contain_exactly(scheme.id, duplicate_scheme.id)
+          end
+        end
+      end
     end
   end
 
diff --git a/spec/services/bulk_upload/lettings/year2024/row_parser_spec.rb b/spec/services/bulk_upload/lettings/year2024/row_parser_spec.rb
index 3faa0a699..68de5d22b 100644
--- a/spec/services/bulk_upload/lettings/year2024/row_parser_spec.rb
+++ b/spec/services/bulk_upload/lettings/year2024/row_parser_spec.rb
@@ -815,6 +815,23 @@ RSpec.describe BulkUpload::Lettings::Year2024::RowParser do
         end
       end
 
+      context "when blank and bulk upload user is support" do
+        let(:bulk_upload) { create(:bulk_upload, :sales, user: create(:user, :support), year: 2024) }
+
+        let(:attributes) { setup_section_params.merge(bulk_upload:, field_3: nil) }
+
+        it "is not permitted" do
+          parser.valid?
+          expect(parser.errors[:field_3]).to be_present
+          expect(parser.errors[:field_3]).to include("You must answer what is the CORE username of the account this letting log should be assigned to?")
+        end
+
+        it "blocks log creation" do
+          parser.valid?
+          expect(parser).to be_block_log_creation
+        end
+      end
+
       context "when user could not be found" do
         let(:attributes) { { bulk_upload:, field_3: "idonotexist@example.com" } }
 
@@ -1439,6 +1456,43 @@ RSpec.describe BulkUpload::Lettings::Year2024::RowParser do
           expect(parser.errors[:field_10]).to include(/Enter a date when the owning and managing organisation was active/)
         end
       end
+
+      context "when user is an unaffiliated non-support user and bulk upload organisation is affiliated with the owning organisation" do
+        let(:affiliated_org) { create(:organisation, :with_old_visible_id) }
+        let(:unaffiliated_user) { create(:user, organisation: create(:organisation)) }
+        let(:attributes) { { bulk_upload:, field_1: affiliated_org.old_visible_id } }
+        let(:organisation_id) { unaffiliated_user.organisation_id }
+
+        before do
+          create(:organisation_relationship, parent_organisation: owning_org, child_organisation: affiliated_org)
+          bulk_upload.update!(organisation_id:, user: unaffiliated_user)
+        end
+
+        it "blocks log creation and adds an error to field_1" do
+          parser = described_class.new(attributes)
+          parser.valid?
+          expect(parser).to be_block_log_creation
+          expect(parser.errors[:field_1]).to include("You do not have permission to add logs for this owning organisation")
+        end
+      end
+
+      context "when user is an unaffiliated support user and bulk upload organisation is affiliated with the owning organisation" do
+        let(:affiliated_org) { create(:organisation, :with_old_visible_id) }
+        let(:unaffiliated_support_user) { create(:user, :support, organisation: create(:organisation)) }
+        let(:attributes) { { bulk_upload:, field_1: affiliated_org.old_visible_id } }
+        let(:organisation_id) { affiliated_org.id }
+
+        before do
+          create(:organisation_relationship, parent_organisation: owning_org, child_organisation: affiliated_org)
+          bulk_upload.update!(organisation_id:, user: unaffiliated_support_user)
+        end
+
+        it "does not block log creation and does not add an error to field_1" do
+          parser = described_class.new(attributes)
+          parser.valid?
+          expect(parser.errors[:field_1]).not_to include("You do not have permission to add logs for this owning organisation")
+        end
+      end
     end
 
     describe "#field_2" do # managing org
diff --git a/spec/services/bulk_upload/sales/year2024/row_parser_spec.rb b/spec/services/bulk_upload/sales/year2024/row_parser_spec.rb
index e428f7792..ca8f29e92 100644
--- a/spec/services/bulk_upload/sales/year2024/row_parser_spec.rb
+++ b/spec/services/bulk_upload/sales/year2024/row_parser_spec.rb
@@ -554,6 +554,43 @@ RSpec.describe BulkUpload::Sales::Year2024::RowParser do
           expect(parser.errors[:field_6]).to include(/Enter a date when the owning organisation was active/)
         end
       end
+
+      context "when user is an unaffiliated non-support user and bulk upload organisation is affiliated with the owning organisation" do
+        let(:affiliated_org) { create(:organisation, :with_old_visible_id) }
+        let(:unaffiliated_user) { create(:user, organisation: create(:organisation)) }
+        let(:attributes) { { bulk_upload:, field_1: affiliated_org.old_visible_id } }
+        let(:organisation_id) { unaffiliated_user.organisation_id }
+
+        before do
+          create(:organisation_relationship, parent_organisation: owning_org, child_organisation: affiliated_org)
+          bulk_upload.update!(organisation_id:, user: unaffiliated_user)
+        end
+
+        it "blocks log creation and adds an error to field_1" do
+          parser = described_class.new(attributes)
+          parser.valid?
+          expect(parser).to be_block_log_creation
+          expect(parser.errors[:field_1]).to include("You do not have permission to add logs for this owning organisation")
+        end
+      end
+
+      context "when user is an unaffiliated support user and bulk upload organisation is affiliated with the owning organisation" do
+        let(:affiliated_org) { create(:organisation, :with_old_visible_id) }
+        let(:unaffiliated_support_user) { create(:user, :support, organisation: create(:organisation)) }
+        let(:attributes) { { bulk_upload:, field_1: affiliated_org.old_visible_id } }
+        let(:organisation_id) { affiliated_org.id }
+
+        before do
+          create(:organisation_relationship, parent_organisation: owning_org, child_organisation: affiliated_org)
+          bulk_upload.update!(organisation_id:, user: unaffiliated_support_user)
+        end
+
+        it "does not block log creation and does not add an error to field_1" do
+          parser = described_class.new(attributes)
+          parser.valid?
+          expect(parser.errors[:field_1]).not_to include("You do not have permission to add logs for this owning organisation")
+        end
+      end
     end
 
     describe "#field_3" do # username for assigned_to
@@ -576,6 +613,23 @@ RSpec.describe BulkUpload::Sales::Year2024::RowParser do
         end
       end
 
+      context "when blank and bulk upload user is support" do
+        let(:bulk_upload) { create(:bulk_upload, :sales, user: create(:user, :support), year: 2024) }
+
+        let(:attributes) { setup_section_params.merge(bulk_upload:, field_3: nil) }
+
+        it "is not permitted" do
+          parser.valid?
+          expect(parser.errors[:field_3]).to be_present
+          expect(parser.errors[:field_3]).to include("You must answer what is the CORE username of the account this sales log should be assigned to?")
+        end
+
+        it "blocks log creation" do
+          parser.valid?
+          expect(parser).to be_block_log_creation
+        end
+      end
+
       context "when user could not be found" do
         let(:attributes) { { bulk_upload:, field_3: "idonotexist@example.com" } }