diff --git a/app/controllers/duplicate_logs_controller.rb b/app/controllers/duplicate_logs_controller.rb
new file mode 100644
index 000000000..21e853bf9
--- /dev/null
+++ b/app/controllers/duplicate_logs_controller.rb
@@ -0,0 +1,50 @@
+class DuplicateLogsController < ApplicationController
+  before_action :authenticate_user!
+  before_action :find_resource_by_named_id
+
+  def show
+    if @log
+      @duplicate_logs = if @log.lettings?
+                          current_user.lettings_logs.duplicate_logs(@log)
+                        else
+                          current_user.sales_logs.duplicate_logs(@log)
+                        end
+      @all_duplicates = [@log, *@duplicate_logs]
+      @duplicate_check_questions = duplicate_check_question_ids.map { |question_id|
+        question = @log.form.get_question(question_id, @log)
+        question if question.page.routed_to?(@log, current_user)
+      }.compact
+    else
+      render_not_found
+    end
+  end
+
+private
+
+  def find_resource_by_named_id
+    @log = if params[:sales_log_id].present?
+             current_user.sales_logs.visible.find_by(id: params[:sales_log_id])
+           else
+             current_user.lettings_logs.visible.find_by(id: params[:lettings_log_id])
+           end
+  end
+
+  def duplicate_check_question_ids
+    if @log.lettings?
+      ["owning_organisation_id",
+       "startdate",
+       "tenancycode",
+       "postcode_full",
+       "scheme_id",
+       "location_id",
+       "age1",
+       "sex1",
+       "ecstat1",
+       @log.household_charge == 1 ? "household_charge" : nil,
+       "tcharge",
+       @log.is_carehome? ? "chcharge" : nil].compact
+    else
+      %w[owning_organisation_id saledate purchid age1 sex1 ecstat1 postcode_full]
+    end
+  end
+end
diff --git a/app/controllers/form_controller.rb b/app/controllers/form_controller.rb
index eb58b656d..93cfda2f0 100644
--- a/app/controllers/form_controller.rb
+++ b/app/controllers/form_controller.rb
@@ -155,6 +155,16 @@ private
   end
 
   def successful_redirect_path
+    if FeatureToggle.deduplication_flow_enabled?
+      if @log.lettings?
+        if current_user.lettings_logs.duplicate_logs(@log).count.positive?
+          return send("lettings_log_duplicate_logs_path", @log)
+        end
+      elsif current_user.sales_logs.duplicate_logs(@log).count.positive?
+        return send("sales_log_duplicate_logs_path", @log)
+      end
+    end
+
     if is_referrer_type?("check_answers")
       next_page_id = form.next_page_id(@page, @log, current_user)
       next_page = form.get_page(next_page_id)
diff --git a/app/helpers/tag_helper.rb b/app/helpers/tag_helper.rb
index 074ef21ed..5a7498b78 100644
--- a/app/helpers/tag_helper.rb
+++ b/app/helpers/tag_helper.rb
@@ -12,6 +12,7 @@ module TagHelper
     activating_soon: "Activating soon",
     reactivating_soon: "Reactivating soon",
     deactivated: "Deactivated",
+    deleted: "Deleted",
   }.freeze
 
   COLOUR = {
@@ -25,6 +26,7 @@ module TagHelper
     activating_soon: "blue",
     reactivating_soon: "blue",
     deactivated: "grey",
+    deleted: "red",
   }.freeze
 
   def status_tag(status, classes = [])
diff --git a/app/models/lettings_log.rb b/app/models/lettings_log.rb
index 48baa7b8e..a1094ee37 100644
--- a/app/models/lettings_log.rb
+++ b/app/models/lettings_log.rb
@@ -54,10 +54,18 @@ class LettingsLog < Log
   scope :unresolved, -> { where(unresolved: true) }
   scope :filter_by_organisation, ->(org, _user = nil) { where(owning_organisation: org).or(where(managing_organisation: org)) }
   scope :duplicate_logs, lambda { |log|
-    visible.where(log.slice(*DUPLICATE_LOG_ATTRIBUTES))
-    .where.not(id: log.id)
-    .where.not("startdate IS NULL OR age1 IS NULL OR sex1 IS NULL OR ecstat1 IS NULL OR tcharge IS NULL OR postcode_full IS NULL OR propcode IS NULL OR needstype IS NULL")
-    .where("location_id = ? OR needstype = 1", log.location_id)
+    visible
+      .where(log.slice(*DUPLICATE_LOG_ATTRIBUTES))
+      .where.not(id: log.id)
+      .where.not(startdate: nil)
+      .where.not(sex1: nil)
+      .where.not(ecstat1: nil)
+      .where.not(needstype: nil)
+      .where("age1 IS NOT NULL OR age1_known = 1")
+      .where("tcharge IS NOT NULL OR household_charge = 1 OR is_carehome = 1")
+      .where("chcharge IS NOT NULL OR is_carehome IS NULL OR is_carehome = 0")
+      .where("location_id = ? OR needstype = 1", log.location_id)
+      .where("postcode_full = ? OR needstype = 2", log.postcode_full)
   }
 
   AUTOGENERATED_FIELDS = %w[id status created_at updated_at discarded_at].freeze
@@ -67,7 +75,7 @@ class LettingsLog < Log
   NUM_OF_WEEKS_FROM_PERIOD = { 2 => 26, 3 => 13, 4 => 12, 5 => 50, 6 => 49, 7 => 48, 8 => 47, 9 => 46, 1 => 52, 10 => 53 }.freeze
   SUFFIX_FROM_PERIOD = { 2 => "every 2 weeks", 3 => "every 4 weeks", 4 => "every month" }.freeze
   RETIREMENT_AGES = { "M" => 67, "F" => 60, "X" => 67 }.freeze
-  DUPLICATE_LOG_ATTRIBUTES = %w[tenancycode propcode startdate age1 sex1 ecstat1 tcharge postcode_full].freeze
+  DUPLICATE_LOG_ATTRIBUTES = %w[tenancycode startdate age1_known age1 sex1 ecstat1 tcharge household_charge chcharge].freeze
 
   def form
     FormHandler.instance.get_form(form_name) || FormHandler.instance.current_lettings_form
diff --git a/app/models/sales_log.rb b/app/models/sales_log.rb
index 311ecc565..ae76e32c3 100644
--- a/app/models/sales_log.rb
+++ b/app/models/sales_log.rb
@@ -44,12 +44,16 @@ class SalesLog < Log
   scope :duplicate_logs, lambda { |log|
     visible.where(log.slice(*DUPLICATE_LOG_ATTRIBUTES))
     .where.not(id: log.id)
-    .where.not("saledate is NULL OR age1 IS NULL OR sex1 IS NULL OR ecstat1 IS NULL OR postcode_full IS NULL")
+    .where.not(saledate: nil)
+    .where.not(sex1: nil)
+    .where.not(ecstat1: nil)
+    .where.not(postcode_full: nil)
+    .where("age1 IS NOT NULL OR age1_known = 1 OR age1_known = 2")
   }
 
   OPTIONAL_FIELDS = %w[purchid othtype].freeze
   RETIREMENT_AGES = { "M" => 65, "F" => 60, "X" => 65 }.freeze
-  DUPLICATE_LOG_ATTRIBUTES = %w[purchid saledate age1 sex1 ecstat1 postcode_full].freeze
+  DUPLICATE_LOG_ATTRIBUTES = %w[purchid saledate age1_known age1 sex1 ecstat1 postcode_full].freeze
 
   def lettings?
     false
diff --git a/app/services/bulk_upload/lettings/year2022/row_parser.rb b/app/services/bulk_upload/lettings/year2022/row_parser.rb
index a1e7dbb06..642c8efe8 100644
--- a/app/services/bulk_upload/lettings/year2022/row_parser.rb
+++ b/app/services/bulk_upload/lettings/year2022/row_parser.rb
@@ -450,7 +450,6 @@ class BulkUpload::Lettings::Year2022::RowParser
       "field_96",  # startdate
       "field_97",  # startdate
       "field_98",  # startdate
-      "field_100", # propcode
       bulk_upload.needstype != 2 ? "field_108" : nil, # postcode
       bulk_upload.needstype != 2 ? "field_109" : nil, # postcode
       "field_111", # owning org
@@ -525,7 +524,6 @@ private
       "ecstat1",
       "owning_organisation",
       "tcharge",
-      "propcode",
       bulk_upload.needstype != 2 ? "postcode_full" : nil,
       bulk_upload.needstype != 1 ? "location" : nil,
     ].compact
@@ -862,7 +860,6 @@ private
       errors.add(:field_96, error_message) # startdate
       errors.add(:field_97, error_message) # startdate
       errors.add(:field_98, error_message) # startdate
-      errors.add(:field_100, error_message) # propcode
       errors.add(:field_108, error_message) if bulk_upload.needstype != 2  # postcode_full
       errors.add(:field_109, error_message) if bulk_upload.needstype != 2  # postcode_full
       errors.add(:field_111, error_message) # owning_organisation
diff --git a/app/services/bulk_upload/lettings/year2023/row_parser.rb b/app/services/bulk_upload/lettings/year2023/row_parser.rb
index 11e9a1e5b..4a12e9083 100644
--- a/app/services/bulk_upload/lettings/year2023/row_parser.rb
+++ b/app/services/bulk_upload/lettings/year2023/row_parser.rb
@@ -464,7 +464,6 @@ class BulkUpload::Lettings::Year2023::RowParser
       "field_8",   # startdate
       "field_9",   # startdate
       "field_13",  # tenancycode
-      "field_14",  # propcode
       field_4 != 1 ? "field_17" : nil,  # location
       field_4 != 2 ? "field_23" : nil,  # postcode
       field_4 != 2 ? "field_24" : nil,  # postcode
@@ -561,7 +560,6 @@ private
       "ecstat1",
       "owning_organisation",
       "tcharge",
-      "propcode",
       field_4 != 2 ? "postcode_full" : nil,
       field_4 != 1 ? "location" : nil,
       "tenancycode",
@@ -856,7 +854,6 @@ private
       errors.add(:field_8, error_message) # startdate
       errors.add(:field_9, error_message) # startdate
       errors.add(:field_13, error_message) # tenancycode
-      errors.add(:field_14, error_message) # propcode
       errors.add(:field_17, error_message) if field_4 != 1 # location
       errors.add(:field_23, error_message) if field_4 != 2 # postcode_full
       errors.add(:field_24, error_message) if field_4 != 2 # postcode_full
diff --git a/app/services/feature_toggle.rb b/app/services/feature_toggle.rb
index 2bc081b56..153b7352a 100644
--- a/app/services/feature_toggle.rb
+++ b/app/services/feature_toggle.rb
@@ -33,4 +33,8 @@ class FeatureToggle
   def self.new_data_protection_confirmation?
     true
   end
+
+  def self.deduplication_flow_enabled?
+    !Rails.env.production?
+  end
 end
diff --git a/app/views/duplicate_logs/_duplicate_log.html.erb b/app/views/duplicate_logs/_duplicate_log.html.erb
new file mode 100644
index 000000000..a93e63570
--- /dev/null
+++ b/app/views/duplicate_logs/_duplicate_log.html.erb
@@ -0,0 +1,26 @@
+<div class="govuk-grid-row govuk-!-padding-top-4">
+    <div class="govuk-grid-column-two-thirds">
+        <div class="govuk-grid-row">
+          <div class="govuk-grid-column-one-third">
+            <header class="app-log-summary__header">
+              <h2 class="app-log-summary__title">
+                <%= govuk_link_to "Log #{log.id}", send("#{log.class.name.underscore}_path", log) %>
+              </h2>
+            </header>
+          </div>
+          <div class="govuk-grid-column-two-thirds">
+            <p class="govuk-body">
+              Created <time datetime="<%= log.created_at.iso8601 %>"><%= log.created_at.to_formatted_s(:govuk_date) %></time>
+              <% if log.created_by %>
+                <span class="app-log-summary__footer--actor">Assigned to <%= log.created_by.name || log.created_by.email %></span>
+              <% end %>
+            </p>
+          </div>
+        </div>
+      </div>
+      <div class="govuk-grid-column-one-third app-log-summary__footer">
+        <p class="govuk-body govuk-!-margin-bottom-2">
+          <%= status_tag(log.status) %>
+        </p>
+    </div>
+</div>
diff --git a/app/views/duplicate_logs/_duplicate_log_check_answers.erb b/app/views/duplicate_logs/_duplicate_log_check_answers.erb
new file mode 100644
index 000000000..15d4caf73
--- /dev/null
+++ b/app/views/duplicate_logs/_duplicate_log_check_answers.erb
@@ -0,0 +1,39 @@
+<div class="x-govuk-summary-card govuk-!-margin-bottom-6">
+  <div class="x-govuk-summary-card__body">
+    <%= govuk_summary_list do |summary_list| %>
+      <% @duplicate_check_questions.each do |question| %>
+        <% summary_list.row do |row| %>
+          <% row.key { get_question_label(question) } %>
+
+          <% row.value do %>
+            <%= simple_format(
+              get_answer_label(question, @log),
+              wrapper_tag: "span",
+              class: "govuk-!-margin-right-4",
+            ) %>
+
+            <% extra_value = question.get_extra_check_answer_value(@log) %>
+
+            <% if extra_value && question.answer_label(@log, current_user).present? %>
+              <%= simple_format(
+                extra_value,
+                wrapper_tag: "span",
+                class: "govuk-!-font-weight-regular app-!-colour-muted",
+              ) %>
+            <% end %>
+
+            <% question.get_inferred_answers(@log).each do |inferred_answer| %>
+              <span class="govuk-!-font-weight-regular app-!-colour-muted"><%= inferred_answer %></span>
+            <% end %>
+          <% end %>
+
+          <% row.action(
+            text: question.action_text(@log),
+            href: action_href(@log, question.page.id),
+            visually_hidden_text: question.check_answer_label.to_s.downcase,
+          ) %>
+        <% end %>
+      <% end %>
+    <% end %>
+  </div>
+</div>
diff --git a/app/views/duplicate_logs/show.erb b/app/views/duplicate_logs/show.erb
new file mode 100644
index 000000000..04da14593
--- /dev/null
+++ b/app/views/duplicate_logs/show.erb
@@ -0,0 +1,20 @@
+<% content_for :title, "Check duplicate logs" %>
+<div class="govuk-grid-row">
+    <div class="govuk-grid-column-two-thirds">
+        <%= govuk_panel(
+            classes: "app-panel--interruption",
+        ) do %>
+            <p class="govuk-heading-l">These logs are duplicates</p>
+            <p class="govuk-body-l">These logs have the same values for the following fields. Choose one to keep or correct the answers.</p>
+        <% end %>
+
+        <% @all_duplicates.each_with_index do |log, index| %>
+            <%= render partial: "duplicate_log", locals: { log: log } %>
+            <%= render partial: "duplicate_log_check_answers", locals: { log: log } %>
+            <%= govuk_button_link_to "Keep this log and delete duplicates", "#" %>
+            <% if index < @all_duplicates.count - 1 %>
+                <hr class="govuk-section-break govuk-section-break--visible govuk-section-break--m">
+            <% end %>
+        <% end %>   
+    </div>
+</div>
diff --git a/config/routes.rb b/config/routes.rb
index 8b61f1ece..707e8e942 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -170,6 +170,7 @@ Rails.application.routes.draw do
 
   resources :lettings_logs, path: "/lettings-logs" do
     get "delete-confirmation", to: "lettings_logs#delete_confirmation"
+    get "duplicate-logs", to: "duplicate_logs#show"
 
     collection do
       post "bulk-upload", to: "bulk_upload#bulk_upload"
@@ -235,6 +236,7 @@ Rails.application.routes.draw do
 
   resources :sales_logs, path: "/sales-logs" do
     get "delete-confirmation", to: "sales_logs#delete_confirmation"
+    get "duplicate-logs", to: "duplicate_logs#show"
 
     collection do
       get "csv-download", to: "sales_logs#download_csv"
diff --git a/spec/models/lettings_log_spec.rb b/spec/models/lettings_log_spec.rb
index b5b5e99cb..e2a15874a 100644
--- a/spec/models/lettings_log_spec.rb
+++ b/spec/models/lettings_log_spec.rb
@@ -2862,14 +2862,6 @@ RSpec.describe LettingsLog do
         end
       end
 
-      context "when there is a log with a different propcode" do
-        let!(:different_propcode) { create(:lettings_log, :duplicate, propcode: "different") }
-
-        it "does not return a log with a different propcode as a duplicate" do
-          expect(described_class.duplicate_logs(log)).not_to include(different_propcode)
-        end
-      end
-
       context "when there is a log with a different tenancycode" do
         let!(:different_tenancycode) { create(:lettings_log, :duplicate, tenancycode: "different") }
 
@@ -2887,10 +2879,10 @@ RSpec.describe LettingsLog do
       end
 
       context "when there is a log with nil values for duplicate check fields" do
-        let!(:duplicate_check_fields_not_given) { create(:lettings_log, :duplicate, age1: nil, sex1: nil, ecstat1: nil, propcode: nil, postcode_known: 2, postcode_full: nil) }
+        let!(:duplicate_check_fields_not_given) { create(:lettings_log, :duplicate, age1: nil, sex1: nil, ecstat1: nil, postcode_known: 2, postcode_full: nil) }
 
         it "does not return a log with nil values as a duplicate" do
-          log.update!(age1: nil, sex1: nil, ecstat1: nil, propcode: nil, postcode_known: 2, postcode_full: nil)
+          log.update!(age1: nil, sex1: nil, ecstat1: nil, postcode_known: 2, postcode_full: nil)
           expect(described_class.duplicate_logs(log)).not_to include(duplicate_check_fields_not_given)
         end
       end
@@ -2904,6 +2896,15 @@ RSpec.describe LettingsLog do
         end
       end
 
+      context "when there is a log with age1 not known" do
+        let!(:age1_not_known) { create(:lettings_log, :duplicate, age1_known: 1, age1: nil) }
+
+        it "returns the log as a duplicate if age1 is not known" do
+          log.update!(age1_known: 1, age1: nil)
+          expect(described_class.duplicate_logs(log)).to include(age1_not_known)
+        end
+      end
+
       context "when there is a duplicate supported housing log" do
         let(:scheme) { create(:scheme) }
         let(:location) { create(:location, scheme:) }
@@ -2919,6 +2920,24 @@ RSpec.describe LettingsLog do
           duplicate_supported_housing_log.update!(location: location_2)
           expect(described_class.duplicate_logs(supported_housing_log)).not_to include(duplicate_supported_housing_log)
         end
+
+        it "does not compare tcharge if there are no household charges" do
+          supported_housing_log.update!(household_charge: 1, supcharg: nil, brent: nil, scharge: nil, pscharge: nil, tcharge: nil)
+          duplicate_supported_housing_log.update!(household_charge: 1, supcharg: nil, brent: nil, scharge: nil, pscharge: nil, tcharge: nil)
+          expect(described_class.duplicate_logs(supported_housing_log)).to include(duplicate_supported_housing_log)
+        end
+
+        it "compares chcharge if it's a carehome" do
+          supported_housing_log.update!(is_carehome: 1, chcharge: 100, supcharg: nil, brent: nil, scharge: nil, pscharge: nil, tcharge: nil)
+          duplicate_supported_housing_log.update!(is_carehome: 1, chcharge: 100, supcharg: nil, brent: nil, scharge: nil, pscharge: nil, tcharge: nil)
+          expect(described_class.duplicate_logs(supported_housing_log)).to include(duplicate_supported_housing_log)
+        end
+
+        it "does not return a duplicate if carehome charge is not given" do
+          supported_housing_log.update!(is_carehome: 1, chcharge: nil, supcharg: nil, brent: nil, scharge: nil, pscharge: nil, tcharge: nil)
+          duplicate_supported_housing_log.update!(is_carehome: 1, chcharge: nil, supcharg: nil, brent: nil, scharge: nil, pscharge: nil, tcharge: nil)
+          expect(described_class.duplicate_logs(supported_housing_log)).not_to include(duplicate_supported_housing_log)
+        end
       end
     end
   end
diff --git a/spec/models/sales_log_spec.rb b/spec/models/sales_log_spec.rb
index c382c364b..d032293c8 100644
--- a/spec/models/sales_log_spec.rb
+++ b/spec/models/sales_log_spec.rb
@@ -249,6 +249,33 @@ RSpec.describe SalesLog, type: :model do
         expect(described_class.duplicate_logs(log)).to include(purchid_not_given)
       end
     end
+
+    context "when there is a log age not known" do
+      let!(:age1_not_known) { create(:sales_log, :duplicate, age1_known: 1, age1: nil) }
+
+      it "returns the log as a duplicate if age is not known" do
+        log.update!(age1_known: 1, age1: nil)
+        expect(described_class.duplicate_logs(log)).to include(age1_not_known)
+      end
+    end
+
+    context "when there is a log age pefers not to say" do
+      let!(:age1_prefers_not_to_say) { create(:sales_log, :duplicate, age1_known: 2, age1: nil) }
+
+      it "returns the log as a duplicate if age is prefers not to say" do
+        log.update!(age1_known: 2, age1: nil)
+        expect(described_class.duplicate_logs(log)).to include(age1_prefers_not_to_say)
+      end
+    end
+
+    context "when there is a log age pefers not to say and not known" do
+      let!(:age1_prefers_not_to_say) { create(:sales_log, :duplicate, age1_known: 2, age1: nil) }
+
+      it "does not return the log as a duplicate if age is prefers not to say" do
+        log.update!(age1_known: 1, age1: nil)
+        expect(described_class.duplicate_logs(log)).not_to include(age1_prefers_not_to_say)
+      end
+    end
   end
 
   describe "derived variables" do
diff --git a/spec/requests/duplicate_logs_controller_spec.rb b/spec/requests/duplicate_logs_controller_spec.rb
new file mode 100644
index 000000000..3ba94c218
--- /dev/null
+++ b/spec/requests/duplicate_logs_controller_spec.rb
@@ -0,0 +1,112 @@
+require "rails_helper"
+
+RSpec.describe DuplicateLogsController, type: :request do
+  let(:page) { Capybara::Node::Simple.new(response.body) }
+  let(:user) { create(:user) }
+
+  context "when a user is signed in" do
+    let(:lettings_log) do
+      create(
+        :lettings_log,
+        :completed,
+        created_by: user,
+      )
+    end
+    let(:sales_log) do
+      create(
+        :sales_log,
+        :completed,
+        created_by: user,
+      )
+    end
+
+    describe "GET" do
+      context "when user is not signed in" do
+        it "redirects to sign in page" do
+          get "/lettings-logs/#{lettings_log.id}/duplicate-logs"
+          expect(response).to redirect_to("/account/sign-in")
+        end
+      end
+
+      context "when the user is from different organisation" do
+        let(:other_user) { create(:user) }
+
+        before do
+          allow(other_user).to receive(:need_two_factor_authentication?).and_return(false)
+          sign_in other_user
+        end
+
+        it "renders page not found" do
+          get "/lettings-logs/#{lettings_log.id}/duplicate-logs"
+          expect(response).to have_http_status(:not_found)
+        end
+      end
+
+      context "when user is signed in" do
+        before do
+          allow(user).to receive(:need_two_factor_authentication?).and_return(false)
+          sign_in user
+        end
+
+        context "with multiple duplicate lettings logs" do
+          let(:duplicate_logs) { create_list(:lettings_log, 2, :completed) }
+
+          before do
+            allow(LettingsLog).to receive(:duplicate_logs).and_return(duplicate_logs)
+            get "/lettings-logs/#{lettings_log.id}/duplicate-logs"
+          end
+
+          it "displays links to all the duplicate logs" do
+            expect(page).to have_link("Log #{lettings_log.id}", href: "/lettings-logs/#{lettings_log.id}")
+            expect(page).to have_link("Log #{duplicate_logs.first.id}", href: "/lettings-logs/#{duplicate_logs.first.id}")
+            expect(page).to have_link("Log #{duplicate_logs.second.id}", href: "/lettings-logs/#{duplicate_logs.second.id}")
+          end
+
+          it "displays check your answers for each log with correct questions" do
+            expect(page).to have_content("Q5 - Tenancy start date", count: 3)
+            expect(page).to have_content("Q7 - Tenant code", count: 3)
+            expect(page).to have_content("Q12 - Postcode", count: 3)
+            expect(page).to have_content("Q32 - Lead tenant’s age", count: 3)
+            expect(page).to have_content("Q33 - Lead tenant’s gender identity", count: 3)
+            expect(page).to have_content("Q37 - Lead tenant’s working situation", count: 3)
+            expect(page).to have_content("Household rent and charges", count: 3)
+            expect(page).to have_link("Change", count: 21)
+          end
+
+          it "displays buttons to delete" do
+            expect(page).to have_link("Keep this log and delete duplicates", count: 3)
+          end
+        end
+
+        context "with multiple duplicate sales logs" do
+          let(:duplicate_logs) { create_list(:sales_log, 2, :completed) }
+
+          before do
+            allow(SalesLog).to receive(:duplicate_logs).and_return(duplicate_logs)
+            get "/sales-logs/#{sales_log.id}/duplicate-logs"
+          end
+
+          it "displays links to all the duplicate logs" do
+            expect(page).to have_link("Log #{sales_log.id}", href: "/sales-logs/#{sales_log.id}")
+            expect(page).to have_link("Log #{duplicate_logs.first.id}", href: "/sales-logs/#{duplicate_logs.first.id}")
+            expect(page).to have_link("Log #{duplicate_logs.second.id}", href: "/sales-logs/#{duplicate_logs.second.id}")
+          end
+
+          it "displays check your answers for each log with correct questions" do
+            expect(page).to have_content("Q1 - Sale completion date", count: 3)
+            expect(page).to have_content("Q2 - Purchaser code", count: 3)
+            expect(page).to have_content("Q20 - Lead buyer’s age", count: 3)
+            expect(page).to have_content("Q21 - Buyer 1’s gender identity", count: 3)
+            expect(page).to have_content("Q25 - Buyer 1's working situation", count: 3)
+            expect(page).to have_content("Q15 - Postcode", count: 3)
+            expect(page).to have_link("Change", count: 18)
+          end
+
+          it "displays buttons to delete" do
+            expect(page).to have_link("Keep this log and delete duplicates", count: 3)
+          end
+        end
+      end
+    end
+  end
+end
diff --git a/spec/requests/form_controller_spec.rb b/spec/requests/form_controller_spec.rb
index 0f086d27a..a6143f91a 100644
--- a/spec/requests/form_controller_spec.rb
+++ b/spec/requests/form_controller_spec.rb
@@ -532,6 +532,54 @@ RSpec.describe FormController, type: :request do
             expect(whodunnit_actor).to be_a(User)
             expect(whodunnit_actor.id).to eq(user.id)
           end
+
+          context "and duplicate logs" do
+            let(:duplicate_logs) { create_list(:lettings_log, 2) }
+
+            before do
+              allow(LettingsLog).to receive(:duplicate_logs).and_return(duplicate_logs)
+              post "/lettings-logs/#{lettings_log.id}/#{page_id.dasherize}", params:
+            end
+
+            it "redirects to the duplicate logs page" do
+              expect(response).to redirect_to("/lettings-logs/#{lettings_log.id}/duplicate-logs")
+              follow_redirect!
+              expect(page).to have_content("These logs are duplicates")
+            end
+          end
+        end
+
+        context "with valid sales answers" do
+          let(:sales_log) do
+            create(
+              :sales_log,
+              created_by: user,
+            )
+          end
+          let(:params) do
+            {
+              id: sales_log.id,
+              sales_log: {
+                page: "buyer-1-age",
+                age1: 20,
+              },
+            }
+          end
+
+          context "and duplicate logs" do
+            let(:duplicate_logs) { create_list(:sales_log, 2) }
+
+            before do
+              allow(SalesLog).to receive(:duplicate_logs).and_return(duplicate_logs)
+              post "/sales-logs/#{sales_log.id}/buyer-1-age", params:
+            end
+
+            it "redirects to the duplicate logs page" do
+              expect(response).to redirect_to("/sales-logs/#{sales_log.id}/duplicate-logs")
+              follow_redirect!
+              expect(page).to have_content("These logs are duplicates")
+            end
+          end
         end
 
         context "when the question has a conditional question" do
diff --git a/spec/services/bulk_upload/lettings/validator_spec.rb b/spec/services/bulk_upload/lettings/validator_spec.rb
index 26134735e..fa913e091 100644
--- a/spec/services/bulk_upload/lettings/validator_spec.rb
+++ b/spec/services/bulk_upload/lettings/validator_spec.rb
@@ -305,7 +305,7 @@ RSpec.describe BulkUpload::Lettings::Validator do
       end
 
       it "creates errors" do
-        expect { validator.call }.to change(BulkUploadError.where(category: :setup, error: "This is a duplicate of a log in your file"), :count).by(22)
+        expect { validator.call }.to change(BulkUploadError.where(category: :setup, error: "This is a duplicate of a log in your file"), :count).by(20)
       end
     end
 
diff --git a/spec/services/bulk_upload/lettings/year2022/row_parser_spec.rb b/spec/services/bulk_upload/lettings/year2022/row_parser_spec.rb
index 4d2c28ee8..b91caa969 100644
--- a/spec/services/bulk_upload/lettings/year2022/row_parser_spec.rb
+++ b/spec/services/bulk_upload/lettings/year2022/row_parser_spec.rb
@@ -258,7 +258,6 @@ RSpec.describe BulkUpload::Lettings::Year2022::RowParser do
               field_96: [error_message], # startdate
               field_97: [error_message], # startdate
               field_98: [error_message], # startdate
-              field_100: [error_message], # propcode
               field_108: [error_message], # postcode_full
               field_109: [error_message], # postcode_full
               field_111: [error_message], # owning_organisation
@@ -295,7 +294,6 @@ RSpec.describe BulkUpload::Lettings::Year2022::RowParser do
               :field_96, # startdate
               :field_97, # startdate
               :field_98, # startdate
-              :field_100, # propcode
               :field_111, # owning_organisation
             ].each do |field|
               expect(parser.errors[field]).to include("This is a duplicate log")
@@ -329,7 +327,6 @@ RSpec.describe BulkUpload::Lettings::Year2022::RowParser do
               :field_96, # startdate
               :field_97, # startdate
               :field_98, # startdate
-              :field_100, # propcode
               :field_108, # postcode_full
               :field_109, # postcode_full
               :field_111, # owning_organisation
diff --git a/spec/services/bulk_upload/lettings/year2023/row_parser_spec.rb b/spec/services/bulk_upload/lettings/year2023/row_parser_spec.rb
index e177eb859..e12785738 100644
--- a/spec/services/bulk_upload/lettings/year2023/row_parser_spec.rb
+++ b/spec/services/bulk_upload/lettings/year2023/row_parser_spec.rb
@@ -289,7 +289,6 @@ RSpec.describe BulkUpload::Lettings::Year2023::RowParser do
                 :field_8, # startdate
                 :field_9, # startdate
                 :field_13, # tenancycode
-                :field_14, # propcode
                 :field_23, # postcode_full
                 :field_24, # postcode_full
                 :field_25, # postcode_full
@@ -328,7 +327,6 @@ RSpec.describe BulkUpload::Lettings::Year2023::RowParser do
                 :field_8, # startdate
                 :field_9, # startdate
                 :field_13, # tenancycode
-                :field_14, # propcode
                 :field_17, # location
                 :field_46, # age1
                 :field_47, # sex1
@@ -363,7 +361,6 @@ RSpec.describe BulkUpload::Lettings::Year2023::RowParser do
                 :field_7, # startdate
                 :field_8, # startdate
                 :field_9, # startdate
-                :field_14, # propcode
                 :field_17, # location
                 :field_23, # postcode_full
                 :field_24, # postcode_full