diff --git a/app/models/case_log.rb b/app/models/case_log.rb
index ae6e06fb6..672ea89ae 100644
--- a/app/models/case_log.rb
+++ b/app/models/case_log.rb
@@ -68,6 +68,7 @@ class CaseLog < ApplicationRecord
   enum housingneeds_f: POLAR, _suffix: true
   enum housingneeds_g: POLAR, _suffix: true
   enum housingneeds_h: POLAR, _suffix: true
+  enum accessibility_requirements_prefer_not_to_say: POLAR, _suffix: true
   enum illness_type_1: POLAR, _suffix: true
   enum illness_type_2: POLAR, _suffix: true
   enum illness_type_3: POLAR, _suffix: true
diff --git a/app/models/constants/case_log.rb b/app/models/constants/case_log.rb
index c503ec1b3..3a537035d 100644
--- a/app/models/constants/case_log.rb
+++ b/app/models/constants/case_log.rb
@@ -65,7 +65,7 @@ module Constants::CaseLog
   ILLNESS = {
     "Yes" => 1,
     "No" => 2,
-    "Do not know" => 3,
+    "Prefer not to say" => 3,
   }.freeze
 
   LEFTREG = {
diff --git a/app/models/validations/household_validations.rb b/app/models/validations/household_validations.rb
index ba29953e7..dc4e9acf2 100644
--- a/app/models/validations/household_validations.rb
+++ b/app/models/validations/household_validations.rb
@@ -74,6 +74,16 @@ module Validations::HouseholdValidations
     validate_person_age_matches_economic_status(record, 1)
   end
 
+  def validate_accessibility_requirements(record)
+    all_options = [record.housingneeds_a, record.housingneeds_b, record.housingneeds_c, record.housingneeds_f, record.housingneeds_g, record.housingneeds_h, record.accessibility_requirements_prefer_not_to_say]
+    if all_options.count("Yes") > 1
+      mobility_accessibility_options = [record.housingneeds_a, record.housingneeds_b, record.housingneeds_c]
+      unless all_options.count("Yes") == 2 && record.housingneeds_f == "Yes" && mobility_accessibility_options.any? { |x| x == "Yes" }
+        record.errors.add :housingneeds_a, "Only one box must be ticked or 'other disabilities' plus one of mobility disabilities"
+      end
+    end
+  end
+
   def validate_shared_housing_rooms(record)
     unless record.unittype_gn.nil?
       if record.unittype_gn == "Bed-sit" && record.beds != 1 && record.beds.present?
diff --git a/spec/features/form/saving_data_spec.rb b/spec/features/form/saving_data_spec.rb
index ab7b03643..f419a3438 100644
--- a/spec/features/form/saving_data_spec.rb
+++ b/spec/features/form/saving_data_spec.rb
@@ -17,7 +17,6 @@ RSpec.describe "Form Saving Data" do
     FactoryBot.create(
       :case_log, :in_progress,
       housingneeds_a: "Yes",
-      housingneeds_c: "Yes",
       owning_organisation: user.organisation,
       managing_organisation: user.organisation
     )
@@ -93,9 +92,5 @@ RSpec.describe "Form Saving Data" do
       "case-log-accessibility-requirements-housingneeds-b-field",
       visible: false,
     )
-    expect(page).to have_checked_field(
-      "case-log-accessibility-requirements-housingneeds-c-field",
-      visible: false,
-    )
   end
 end
diff --git a/spec/models/case_log_spec.rb b/spec/models/case_log_spec.rb
index ed39fcb1f..b2d9e5820 100644
--- a/spec/models/case_log_spec.rb
+++ b/spec/models/case_log_spec.rb
@@ -826,6 +826,61 @@ RSpec.describe Form, type: :model do
         }.not_to raise_error
       end
     end
+
+    context "For accessibility requirements" do
+      it "validates that only one option can be selected" do
+        expect {
+          CaseLog.create!(housingneeds_a: "Yes",
+                          housingneeds_b: "Yes",
+                          rent_type: "London Affordable rent",
+                          owning_organisation: owning_organisation,
+                          managing_organisation: managing_organisation)
+        }.to raise_error(ActiveRecord::RecordInvalid)
+      end
+
+      it "validates that only one option a, b, or c can be selected in conjunction with f" do
+        expect {
+          CaseLog.create!(housingneeds_a: "Yes",
+                          housingneeds_f: "Yes",
+                          rent_type: "London Affordable rent",
+                          owning_organisation: owning_organisation,
+                          managing_organisation: managing_organisation)
+        }.to_not raise_error
+
+        expect {
+          CaseLog.create!(housingneeds_b: "Yes",
+                          housingneeds_f: "Yes",
+                          rent_type: "London Affordable rent",
+                          owning_organisation: owning_organisation,
+                          managing_organisation: managing_organisation)
+        }.to_not raise_error
+
+        expect {
+          CaseLog.create!(housingneeds_c: "Yes",
+                          housingneeds_f: "Yes",
+                          rent_type: "London Affordable rent",
+                          owning_organisation: owning_organisation,
+                          managing_organisation: managing_organisation)
+        }.to_not raise_error
+
+        expect {
+          CaseLog.create!(housingneeds_g: "Yes",
+                          housingneeds_f: "Yes",
+                          rent_type: "London Affordable rent",
+                          owning_organisation: owning_organisation,
+                          managing_organisation: managing_organisation)
+        }.to raise_error(ActiveRecord::RecordInvalid)
+
+        expect {
+          CaseLog.create!(housingneeds_a: "Yes",
+                          housingneeds_b: "Yes",
+                          housingneeds_f: "Yes",
+                          rent_type: "London Affordable rent",
+                          owning_organisation: owning_organisation,
+                          managing_organisation: managing_organisation)
+        }.to raise_error(ActiveRecord::RecordInvalid)
+      end
+    end
   end
 
   describe "status" do
diff --git a/spec/requests/form_controller_spec.rb b/spec/requests/form_controller_spec.rb
index b8f889cb9..ee9115184 100644
--- a/spec/requests/form_controller_spec.rb
+++ b/spec/requests/form_controller_spec.rb
@@ -135,9 +135,7 @@ RSpec.describe FormController, type: :request do
             case_log: {
               page: "accessibility_requirements",
               accessibility_requirements:
-                                     %w[ housingneeds_a
-                                         housingneeds_b
-                                         housingneeds_c],
+                                     %w[housingneeds_b],
             },
           }
         end
@@ -156,16 +154,13 @@ RSpec.describe FormController, type: :request do
           post "/logs/#{case_log.id}/form", params: case_log_form_params
           case_log.reload
 
-          expect(case_log.housingneeds_a).to eq("Yes")
           expect(case_log.housingneeds_b).to eq("Yes")
-          expect(case_log.housingneeds_c).to eq("Yes")
         end
 
         it "sets previously submitted items to false when resubmitted with new values" do
           post "/logs/#{case_log.id}/form", params: new_case_log_form_params
           case_log.reload
 
-          expect(case_log.housingneeds_a).to eq("No")
           expect(case_log.housingneeds_b).to eq("No")
           expect(case_log.housingneeds_c).to eq("Yes")
         end
@@ -179,8 +174,7 @@ RSpec.describe FormController, type: :request do
                 page: "accessibility_requirements",
                 accessibility_requirements:
                                        %w[ housingneeds_a
-                                           housingneeds_b
-                                           housingneeds_c],
+                                           housingneeds_f],
                 tenant_code: tenant_code,
               },
             }
@@ -213,8 +207,7 @@ RSpec.describe FormController, type: :request do
             case_log.reload
 
             expect(case_log.housingneeds_a).to eq("Yes")
-            expect(case_log.housingneeds_b).to eq("Yes")
-            expect(case_log.housingneeds_c).to eq("Yes")
+            expect(case_log.housingneeds_f).to eq("Yes")
             expect(case_log.tenant_code).to eq(tenant_code)
           end
         end