diff --git a/app/services/csv/lettings_log_csv_service.rb b/app/services/csv/lettings_log_csv_service.rb
index 6521fa52c..146a720d5 100644
--- a/app/services/csv/lettings_log_csv_service.rb
+++ b/app/services/csv/lettings_log_csv_service.rb
@@ -280,32 +280,6 @@ module Csv
 
     SCHEME_AND_LOCATION_ATTRIBUTES = %w[scheme_code scheme_service_name scheme_confidential SCHTYPE scheme_registered_under_care_act scheme_owning_organisation_name scheme_primary_client_group scheme_has_other_client_group scheme_secondary_client_group scheme_support_type scheme_intended_stay scheme_created_at location_code location_postcode location_name location_units location_type_of_unit location_mobility_type location_local_authority location_startdate].freeze
 
-    # TODO: (CLDC-4462): delete once address data for logs in confidential schemes is wiped.
-    # Interim measure: logs in a confidential scheme that were created before the
-    # confidential address feature may still hold property address/UPRN data that is no
-    # longer collected. Blank those columns in the download until the data is wiped (the
-    # local authority, derived from the scheme location, is intentionally retained).
-    ADDRESS_FIELDS_HIDDEN_FOR_CONFIDENTIAL_SCHEME = %w[
-      uprn
-      uprn_known
-      uprn_confirmed
-      uprn_selection
-      address_line1
-      address_line2
-      town_or_city
-      county
-      postcode_full
-      postcode_known
-      address_line1_input
-      postcode_full_input
-      address_line1_as_entered
-      address_line2_as_entered
-      town_or_city_as_entered
-      county_as_entered
-      postcode_full_as_entered
-      la_as_entered
-    ].freeze
-
     def lettings_log_attributes
       ordered_questions = FormHandler.instance.ordered_questions_for_year(@year, "lettings")
       soft_validations_attributes = soft_validations_attributes(ordered_questions)
@@ -370,7 +344,6 @@ module Csv
 
     def value(attribute, log)
       attribute = "rent_type" if attribute == "rent_type_detail" # rent_type_detail is the requested column header for rent_type, so as not to confuse with renttype. It can be exported as label or code.
-      return nil if hide_confidential_scheme_address?(attribute, log) # TODO: (CLDC-4462): delete once address data for logs in confidential schemes is wiped.
 
       if CUSTOM_CALL_CHAINS.key? attribute.to_sym
         call_chain = CUSTOM_CALL_CHAINS[attribute.to_sym][@export_type.to_sym]
@@ -404,16 +377,6 @@ module Csv
       end
     end
 
-    # TODO: (CLDC-4462): delete once address data for logs in confidential schemes is wiped.
-    def hide_confidential_scheme_address?(attribute, log)
-      ADDRESS_FIELDS_HIDDEN_FOR_CONFIDENTIAL_SCHEME.include?(attribute) && confidential_scheme_ids.include?(log.scheme_id)
-    end
-
-    # TODO: (CLDC-4462): delete once address data for logs in confidential schemes is wiped.
-    def confidential_scheme_ids
-      @confidential_scheme_ids ||= Scheme.where(sensitive: "Yes").pluck(:id).to_set
-    end
-
     def person_details_not_known?(log, attribute)
       details_known_field = PERSON_DETAILS.find { |key, _value| key == attribute }[1]["details_known_field"]
       log[details_known_field] == 1 # 1 for lettings logs, 2 for sales logs
diff --git a/spec/models/lettings_log_spec.rb b/spec/models/lettings_log_spec.rb
index 779b7be4a..a29589181 100644
--- a/spec/models/lettings_log_spec.rb
+++ b/spec/models/lettings_log_spec.rb
@@ -467,7 +467,7 @@ RSpec.describe LettingsLog do
 
       describe "when changing a log's scheme and hence calling reset_scheme_location!" do
         context "when there is one valid location and many invalid locations in the new scheme" do
-          let(:scheme) { create(:scheme) }
+          let(:scheme) { create(:scheme, sensitive: 0) }
           let(:invalid_location_1) { create(:location, scheme:, startdate: Time.zone.today + 3.weeks) }
           let(:valid_location) { create(:location, scheme:, startdate: Time.zone.yesterday) }
           let(:invalid_location_2) { create(:location, scheme:, startdate: Time.zone.today + 3.weeks) }
@@ -479,9 +479,9 @@ RSpec.describe LettingsLog do
         end
 
         context "when there are many valid locations in the new scheme" do
-          let(:old_scheme) { create(:scheme, owning_organisation:) }
+          let(:old_scheme) { create(:scheme, sensitive: 0, owning_organisation:) }
           let(:old_location) { create(:location, scheme: old_scheme) }
-          let(:new_scheme) { create(:scheme, owning_organisation:) }
+          let(:new_scheme) { create(:scheme, sensitive: 0, owning_organisation:) }
 
           before do
             create_list(:location, 2, scheme: new_scheme)
@@ -508,7 +508,7 @@ RSpec.describe LettingsLog do
       end
 
       context "and a scheme with a single log is selected" do
-        let(:scheme) { create(:scheme, owning_organisation:) }
+        let(:scheme) { create(:scheme, sensitive: 0, owning_organisation:) }
         let!(:location) { create(:location, scheme:) }
 
         before do
@@ -666,7 +666,7 @@ RSpec.describe LettingsLog do
       end
 
       context "and not renewal" do
-        let(:scheme) { create(:scheme, owning_organisation:) }
+        let(:scheme) { create(:scheme, sensitive: 0, owning_organisation:) }
         let(:location) { create(:location, scheme:, postcode: "M11AE", type_of_unit: 1, mobility_type: "W") }
 
         let(:supported_housing_lettings_log) do
@@ -1091,7 +1091,7 @@ RSpec.describe LettingsLog do
   end
 
   describe "resetting invalidated fields" do
-    let(:scheme) { create(:scheme, owning_organisation: assigned_to_user.organisation) }
+    let(:scheme) { create(:scheme, sensitive: 0, owning_organisation: assigned_to_user.organisation) }
     let!(:location) { create(:location, location_code: "E07000223", scheme:) }
     let(:lettings_log) do
       create(
@@ -1181,7 +1181,7 @@ RSpec.describe LettingsLog do
       let(:organisation_2) { create(:organisation) }
 
       context "when the organisation selected doesn't match the scheme set" do
-        let(:scheme) { create(:scheme, owning_organisation: assigned_to_user.organisation) }
+        let(:scheme) { create(:scheme, sensitive: 0, owning_organisation: assigned_to_user.organisation) }
         let(:location) { create_list(:location, 2, scheme:).first }
         let(:lettings_log) { create(:lettings_log, owning_organisation: nil, needstype: 2, scheme_id: scheme.id, location_id: location.id) }
 
@@ -1194,7 +1194,7 @@ RSpec.describe LettingsLog do
       end
 
       context "when the organisation selected still matches the scheme set" do
-        let(:scheme) { create(:scheme, owning_organisation: organisation_2) }
+        let(:scheme) { create(:scheme, sensitive: 0, owning_organisation: organisation_2) }
         let(:location) { create_list(:location, 2, scheme:).first }
         let(:lettings_log) { create(:lettings_log, owning_organisation: nil, needstype: 2, scheme_id: scheme.id, location_id: location.id) }
 
@@ -1797,7 +1797,7 @@ RSpec.describe LettingsLog do
       end
 
       context "when there is a duplicate supported housing log" do
-        let(:scheme) { create(:scheme) }
+        let(:scheme) { create(:scheme, sensitive: 0) }
         let(:location) { create(:location, scheme:) }
         let(:location_2) { create(:location, scheme:) }
         let(:supported_housing_log) { create(:lettings_log, :duplicate, needstype: 2, location:, scheme:, owning_organisation: organisation) }
@@ -1963,7 +1963,7 @@ RSpec.describe LettingsLog do
       end
 
       context "when there is a duplicate supported housing log" do
-        let(:scheme) { create(:scheme, owning_organisation: organisation) }
+        let(:scheme) { create(:scheme, sensitive: 0, owning_organisation: organisation) }
         let(:location) { create(:location, scheme:) }
         let!(:supported_housing_log) { create(:lettings_log, :duplicate, needstype: 2, location:, scheme:, owning_organisation: organisation) }
         let!(:duplicate_supported_housing_log) { create(:lettings_log, :duplicate, needstype: 2, location:, scheme:, owning_organisation: organisation) }
@@ -2240,5 +2240,104 @@ RSpec.describe LettingsLog do
       expect(log.scheme_has_confidential_information?).to be true
     end
   end
+
+  describe "clearing confidential scheme address data on save" do
+    let(:owning_organisation) { create(:organisation) }
+    let(:scheme) { create(:scheme, sensitive: 1, owning_organisation:) }
+    let(:location) { create(:location, scheme:) }
+    let(:log) do
+      create(
+        :lettings_log,
+        :ignore_validation_errors,
+        needstype: 2,
+        owning_organisation:,
+        managing_organisation: owning_organisation,
+        scheme:,
+        location:,
+        startdate: Time.zone.local(2026, 5, 1),
+      )
+    end
+
+    it "clears address, UPRN and LA data collected before the confidential address feature" do
+      log.update_columns(
+        uprn: "123456789012",
+        uprn_known: 1,
+        uprn_confirmed: 1,
+        uprn_selection: "123456789012",
+        address_line1: "1 Secret Street",
+        address_line2: "Flat 2",
+        town_or_city: "Secretville",
+        county: "Secretshire",
+        postcode_known: 1,
+        address_line1_input: "1 Secret Street input",
+        postcode_full_input: "AB1 2CD",
+        address_line1_as_entered: "1 Secret Street as entered",
+        address_line2_as_entered: "Flat 2 as entered",
+        town_or_city_as_entered: "Secretville as entered",
+        county_as_entered: "Secretshire as entered",
+        postcode_full_as_entered: "AB1 2CD",
+        la_as_entered: "la as entered",
+        address_search_value_check: 1,
+        la: "E09000003",
+        is_la_inferred: true,
+      )
+
+      log.skip_uprn_lookup = true
+      log.skip_address_lookup = true
+      log.valid?
+      log.save!(validate: false)
+      log.reload
+
+      expect(log.uprn).to be_nil
+      expect(log.uprn_known).to be_nil
+      expect(log.uprn_confirmed).to be_nil
+      expect(log.uprn_selection).to be_nil
+      expect(log.address_line1).to be_nil
+      expect(log.address_line2).to be_nil
+      expect(log.town_or_city).to be_nil
+      expect(log.county).to be_nil
+      expect(log.postcode_known).to be_nil
+      expect(log.address_line1_input).to be_nil
+      expect(log.postcode_full_input).to be_nil
+      expect(log.address_line1_as_entered).to be_nil
+      expect(log.address_line2_as_entered).to be_nil
+      expect(log.town_or_city_as_entered).to be_nil
+      expect(log.county_as_entered).to be_nil
+      expect(log.postcode_full_as_entered).to be_nil
+      expect(log.la_as_entered).to be_nil
+      expect(log.address_search_value_check).to be_nil
+      # la is deliberately left null in the DB - see LettingsLog#la, which derives it live
+      # from the scheme location on every read, and reset_and_infer_la! (which only records
+      # whether that fallback resolves, via is_la_inferred, without persisting the value)
+      expect(log[:la]).to be_nil
+      expect(log.la).to eq(location.location_code)
+      expect(log.is_la_inferred).to be true
+    end
+
+    it "still infers the local authority from the scheme's location after clearing" do
+      log.update_columns(la: "E09000003", is_la_inferred: false)
+      log.valid?
+      log.save!(validate: false)
+      expect(log.la).to eq(location.location_code)
+      expect(log[:la]).to be_nil
+      expect(log.is_la_inferred).to be true
+    end
+
+    it "leaves la blank and is_la_inferred false when the location has no resolvable local authority" do
+      location.update_columns(location_code: nil, location_admin_district: nil, is_la_inferred: false)
+      log.update_columns(la: "E09000003", is_la_inferred: false)
+      log.valid?
+      log.save!(validate: false)
+      expect(log.la).to be_nil
+      expect(log.is_la_inferred).to be false
+    end
+
+    it "does not affect the scheme or location" do
+      log.update_columns(address_line1: "1 Secret Street")
+      log.valid?
+      expect { log.save!(validate: false) }.not_to change(log, :scheme_id)
+      expect(log.location_id).to eq(location.id)
+    end
+  end
 end
 # rubocop:enable RSpec/MessageChain
diff --git a/spec/services/csv/lettings_log_csv_service_spec.rb b/spec/services/csv/lettings_log_csv_service_spec.rb
index 2e52328f4..bc41ee31d 100644
--- a/spec/services/csv/lettings_log_csv_service_spec.rb
+++ b/spec/services/csv/lettings_log_csv_service_spec.rb
@@ -193,14 +193,31 @@ RSpec.describe Csv::LettingsLogCsvService do
       end
     end
 
-    # TODO: (CLDC-4462): delete once address data for logs in confidential schemes is wiped.
     describe "confidential scheme behaviour" do
       let(:year) { 2026 }
       let(:owning_organisation) { create(:organisation) }
       let(:scheme) { create(:scheme, sensitive: 1, owning_organisation:) }
       let(:location) { create(:location, scheme:) }
-      # Every hidden field that actually appears as a column in this export.
-      let(:hidden_columns) { described_class::ADDRESS_FIELDS_HIDDEN_FOR_CONFIDENTIAL_SCHEME & attribute_line }
+      # Address/UPRN columns that have no location-based fallback, so must simply be nil.
+      let(:blanked_columns) do
+        %w[uprn
+           uprn_known
+           uprn_confirmed
+           uprn_selection
+           address_line1
+           address_line2
+           town_or_city
+           county
+           postcode_known
+           address_line1_input
+           postcode_full_input
+           address_line1_as_entered
+           address_line2_as_entered
+           town_or_city_as_entered
+           county_as_entered
+           postcode_full_as_entered
+           la_as_entered] & attribute_line
+      end
       let(:log) do
         create(
           :lettings_log,
@@ -214,8 +231,9 @@ RSpec.describe Csv::LettingsLogCsvService do
           startdate: Time.zone.local(2026, 5, 1),
         ).tap do |confidential_log|
           # Simulate a log created before the confidential address feature that still holds
-          # property address data in the database. Populate every hidden address column so
-          # that the blanking is observable (a nil column would pass the assertion vacuously).
+          # property address data in the database, bypassing callbacks/validations. Saving it
+          # again (as any ordinary edit of the log would) must clear this legacy data via
+          # DerivedVariables::LettingsLogVariables#set_derived_fields!.
           confidential_log.update_columns(
             uprn: "123456789012",
             uprn_known: 1,
@@ -225,7 +243,6 @@ RSpec.describe Csv::LettingsLogCsvService do
             address_line2: "Flat 2",
             town_or_city: "Secretville",
             county: "Secretshire",
-            postcode_full: "AB1 2CD",
             postcode_known: 1,
             address_line1_input: "1 Secret Street input",
             postcode_full_input: "AB1 2CD",
@@ -237,6 +254,10 @@ RSpec.describe Csv::LettingsLogCsvService do
             la_as_entered: "la as entered",
             la: "E09000003",
           )
+          confidential_log.skip_uprn_lookup = true
+          confidential_log.skip_address_lookup = true
+          confidential_log.valid?
+          confidential_log.save!(validate: false)
         end
       end
 
@@ -245,26 +266,16 @@ RSpec.describe Csv::LettingsLogCsvService do
       end
 
       context "when a log's scheme is confidential" do
-        it "blanks every hidden address and UPRN column" do
-          expect(hidden_columns).not_to be_empty
-          hidden_columns.each do |attribute|
+        it "blanks every hidden address and UPRN column with no location-based fallback" do
+          expect(blanked_columns).not_to be_empty
+          blanked_columns.each do |attribute|
             expect(csv_value(attribute)).to be_nil, "expected the #{attribute} column to be blank for a confidential-scheme log"
           end
         end
 
-        it "still exports the local authority" do
-          expect(csv_value("la")).to eq("E09000003")
-        end
-      end
-
-      context "when the scheme is not confidential" do
-        let(:scheme) { create(:scheme, sensitive: 0, owning_organisation:) }
-
-        it "exports every one of those columns as normal" do
-          expect(hidden_columns).not_to be_empty
-          hidden_columns.each do |attribute|
-            expect(csv_value(attribute)).not_to be_nil, "expected the #{attribute} column to be populated for a non-confidential-scheme log"
-          end
+        it "exports the local authority and postcode inferred from the scheme's location, not the log's own (cleared) values" do
+          expect(csv_value("la")).to eq(location.location_code)
+          expect(csv_value("postcode_full")).to eq(location.postcode) if attribute_line.include?("postcode_full")
         end
       end
     end