diff --git a/app/frontend/controllers/address_search_controller.js b/app/frontend/controllers/address_search_controller.js
index de54090ec..b3410e49d 100644
--- a/app/frontend/controllers/address_search_controller.js
+++ b/app/frontend/controllers/address_search_controller.js
@@ -4,10 +4,28 @@ import 'accessible-autocomplete/dist/accessible-autocomplete.min.css'
 
 const options = []
 
+let latestQueryId = 0
+
+const sleep = (ms) => {
+  return new Promise(resolve => setTimeout(resolve, ms))
+}
+
 const fetchOptions = async (query, searchUrl) => {
   if (query.length < 2) {
     throw new Error('Query must be at least 2 characters long.')
   }
+
+  // implement a debounce
+  // this is because this API has periods of high latency if OS Places has an outage
+  // making too many requests can overwhelm the number of threads available on the server
+  // which can in turn cause a site wide outage
+  latestQueryId++
+  const myQueryId = latestQueryId
+  await sleep(500)
+  if (myQueryId !== latestQueryId) {
+    throw new Error('Outdated query, ignoring result.')
+  }
+
   try {
     const response = await fetch(`${searchUrl}?query=${encodeURIComponent(query.trim())}`)
     return await response.json()
diff --git a/app/models/validations/financial_validations.rb b/app/models/validations/financial_validations.rb
index 7827fbb16..6f135aa39 100644
--- a/app/models/validations/financial_validations.rb
+++ b/app/models/validations/financial_validations.rb
@@ -20,6 +20,8 @@ module Validations::FinancialValidations
       is_partner_or_main = relationship == "P" || n == 1
       if is_employed && is_partner_or_main && record.benefits == 1
         record.errors.add :benefits, I18n.t("validations.lettings.financial.benefits.part_or_full_time")
+        record.errors.add "ecstat#{n}", I18n.t("validations.lettings.financial.ecstat.part_or_full_time")
+        record.errors.add "relat#{n}", I18n.t("validations.lettings.financial.relat.part_or_full_time", person_num: n) if n > 1
       end
     end
   end
diff --git a/app/models/validations/property_validations.rb b/app/models/validations/property_validations.rb
index 4b34d2d3c..ed155da95 100644
--- a/app/models/validations/property_validations.rb
+++ b/app/models/validations/property_validations.rb
@@ -32,6 +32,7 @@ module Validations::PropertyValidations
     end
   end
 
+  # see also: this validation in sales/property_validations.rb
   def validate_uprn(record)
     return unless record.uprn
 
@@ -40,6 +41,7 @@ module Validations::PropertyValidations
     record.errors.add :uprn, I18n.t("validations.lettings.property.uprn.invalid")
   end
 
+  # see also: this validation in sales/property_validations.rb
   def validate_property_postcode(record)
     postcode = record.postcode_full
     return unless postcode
@@ -50,6 +52,7 @@ module Validations::PropertyValidations
     end
   end
 
+  # see also: this validation in sales/property_validations.rb
   def validate_la_in_england(record)
     return unless record.form.start_year_2025_or_later?
 
@@ -60,7 +63,6 @@ module Validations::PropertyValidations
       record.errors.add :la, I18n.t("validations.lettings.property.la.not_in_england")
       record.errors.add :postcode_full, I18n.t("validations.lettings.property.postcode_full.not_in_england")
       record.errors.add :uprn, I18n.t("validations.lettings.property.uprn.not_in_england")
-      record.errors.add :uprn_confirmation, I18n.t("validations.lettings.property.uprn_confirmation.not_in_england")
       record.errors.add :uprn_selection, I18n.t("validations.lettings.property.uprn_selection.not_in_england")
       if record.uprn.present?
         record.errors.add :startdate, I18n.t("validations.lettings.property.startdate.address_not_in_england")
@@ -76,4 +78,39 @@ module Validations::PropertyValidations
       record.errors.add :startdate, I18n.t("validations.lettings.property.startdate.location_not_in_england")
     end
   end
+
+  # see also: this validation in sales/property_validations.rb
+  def validate_la_is_active(record)
+    return unless record.form.start_year_2025_or_later? && record.startdate.present?
+
+    if record.is_general_needs?
+      return unless record.la
+
+      la = LocalAuthority.england.find_by(code: record.la)
+
+      # will be caught by the not in england validation
+      return if la.nil?
+      # only compare end date if it exists
+      return if record.startdate >= la.start_date && (la.end_date.nil? || record.startdate <= la.end_date)
+
+      record.errors.add :la, I18n.t("validations.lettings.property.la.la_not_valid_for_date", la: la.name)
+      record.errors.add :postcode_full, I18n.t("validations.lettings.property.postcode_full.la_not_valid_for_date", la: la.name)
+      record.errors.add :uprn, I18n.t("validations.lettings.property.uprn.la_not_valid_for_date", la: la.name)
+      record.errors.add :uprn_selection, I18n.t("validations.lettings.property.uprn_selection.la_not_valid_for_date", la: la.name)
+      record.errors.add :startdate, I18n.t("validations.lettings.property.startdate.la_not_valid_for_date", la: la.name)
+    elsif record.is_supported_housing?
+      return unless record.location
+
+      la = LocalAuthority.england.find_by(code: record.location.location_code)
+
+      # will be caught by the not in england validation
+      return if la.nil?
+      # only compare end date if it exists
+      return if record.startdate >= la.start_date && (la.end_date.nil? || record.startdate <= la.end_date)
+
+      record.errors.add :location_id, I18n.t("validations.lettings.property.location_id.la_not_valid_for_date", la: la.name)
+      record.errors.add :scheme_id, I18n.t("validations.lettings.property.scheme_id.la_not_valid_for_date", la: la.name)
+      record.errors.add :startdate, I18n.t("validations.lettings.property.startdate.la_not_valid_for_date", la: la.name)
+    end
+  end
 end
diff --git a/app/models/validations/sales/property_validations.rb b/app/models/validations/sales/property_validations.rb
index 56a09c36f..16d4c93f7 100644
--- a/app/models/validations/sales/property_validations.rb
+++ b/app/models/validations/sales/property_validations.rb
@@ -21,6 +21,7 @@ module Validations::Sales::PropertyValidations
     end
   end
 
+  # see also: this validation in validations/property_validations.rb
   def validate_uprn(record)
     return unless record.uprn
 
@@ -29,6 +30,7 @@ module Validations::Sales::PropertyValidations
     record.errors.add :uprn, I18n.t("validations.sales.property_information.uprn.invalid")
   end
 
+  # see also: this validation in validations/property_validations.rb
   def validate_property_postcode(record)
     postcode = record.postcode_full
     return unless postcode
@@ -39,6 +41,7 @@ module Validations::Sales::PropertyValidations
     end
   end
 
+  # see also: this validation in validations/property_validations.rb
   def validate_la_in_england(record)
     return unless record.form.start_year_2025_or_later? && record.la.present?
     return if record.la.in?(LocalAuthority.england.pluck(:code))
@@ -46,7 +49,6 @@ module Validations::Sales::PropertyValidations
     record.errors.add :la, I18n.t("validations.sales.property_information.la.not_in_england")
     record.errors.add :postcode_full, I18n.t("validations.sales.property_information.postcode_full.not_in_england")
     record.errors.add :uprn, I18n.t("validations.sales.property_information.uprn.not_in_england")
-    record.errors.add :uprn_confirmation, I18n.t("validations.sales.property_information.uprn_confirmation.not_in_england")
     record.errors.add :uprn_selection, I18n.t("validations.sales.property_information.uprn_selection.not_in_england")
     if record.uprn.present?
       record.errors.add :saledate, :skip_bu_error, message: I18n.t("validations.sales.property_information.saledate.address_not_in_england")
@@ -54,4 +56,22 @@ module Validations::Sales::PropertyValidations
       record.errors.add :saledate, :skip_bu_error, message: I18n.t("validations.sales.property_information.saledate.postcode_not_in_england")
     end
   end
+
+  # see also: this validation in validations/property_validations.rb
+  def validate_la_is_active(record)
+    return unless record.form.start_year_2025_or_later? && record.la.present? && record.startdate.present?
+
+    la = LocalAuthority.england.find_by(code: record.la)
+
+    # will be caught by the not in england validation
+    return if la.nil?
+    # only compare end date if it exists
+    return if record.startdate >= la.start_date && (la.end_date.nil? || record.startdate <= la.end_date)
+
+    record.errors.add :la, I18n.t("validations.sales.property_information.la.la_not_valid_for_date", la: la.name)
+    record.errors.add :postcode_full, I18n.t("validations.sales.property_information.postcode_full.la_not_valid_for_date", la: la.name)
+    record.errors.add :uprn, I18n.t("validations.sales.property_information.uprn.la_not_valid_for_date", la: la.name)
+    record.errors.add :uprn_selection, I18n.t("validations.sales.property_information.uprn_selection.la_not_valid_for_date", la: la.name)
+    record.errors.add :saledate, :skip_bu_error, message: I18n.t("validations.sales.property_information.saledate.la_not_valid_for_date", la: la.name)
+  end
 end
diff --git a/app/services/address_client.rb b/app/services/address_client.rb
index 20cf603fe..3fca0a0d0 100644
--- a/app/services/address_client.rb
+++ b/app/services/address_client.rb
@@ -35,7 +35,7 @@ private
     client.use_ssl = true
     client.verify_mode = OpenSSL::SSL::VERIFY_PEER
     client.max_retries = 3
-    client.read_timeout = 30 # seconds
+    client.read_timeout = 15 # seconds
     client
   end
 
diff --git a/app/services/uprn_client.rb b/app/services/uprn_client.rb
index f847c7da5..8dcd2e7a0 100644
--- a/app/services/uprn_client.rb
+++ b/app/services/uprn_client.rb
@@ -39,7 +39,7 @@ private
     client.use_ssl = true
     client.verify_mode = OpenSSL::SSL::VERIFY_PEER
     client.max_retries = 3
-    client.read_timeout = 30 # seconds
+    client.read_timeout = 15 # seconds
     client
   end
 
diff --git a/app/views/organisation_relationships/add_managing_agent.html.erb b/app/views/organisation_relationships/add_managing_agent.html.erb
index 71e4b5abc..6fc4692de 100644
--- a/app/views/organisation_relationships/add_managing_agent.html.erb
+++ b/app/views/organisation_relationships/add_managing_agent.html.erb
@@ -31,7 +31,7 @@
     <%= govuk_list [
       "Double check the spelling and try again",
       "Type the first few letters to see the suggestions",
-      "If you still can't find it, #{govuk_link_to('contact the MHCLG service desk', GlobalConstants::HELPDESK_URL, rel: 'noreferrer noopener', target: '_blank')}",
+      "If you still can't find it, #{govuk_link_to('contact the MHCLG service desk', GlobalConstants::HELPDESK_URL, rel: 'noreferrer noopener', target: '_blank')}".html_safe,
       ], type: :bullet %>
   <% end %>
 <% end %>
diff --git a/config/locales/forms/2025/sales/household_characteristics.en.yml b/config/locales/forms/2025/sales/household_characteristics.en.yml
index c0dab7df6..c61156199 100644
--- a/config/locales/forms/2025/sales/household_characteristics.en.yml
+++ b/config/locales/forms/2025/sales/household_characteristics.en.yml
@@ -223,13 +223,13 @@ en:
               page_header: ""
               check_answer_label: "Number of other people living in the property"
               check_answer_prompt: ""
-              hint_text: "You can provide details for a maximum of 4 other people for a joint purchase."
+              hint_text: "Include all people living in the property who are not the buyers. In later questions you will only be asked for details about the first 4 other people for a joint purchase."
               question_text: "Besides the buyers, how many other people live or will live in the property?"
             not_joint_purchase:
               page_header: ""
               check_answer_label: "Number of other people living in the property"
               check_answer_prompt: ""
-              hint_text: "You can provide details for a maximum of 5 other people if there is only one buyer."
+              hint_text: "Include all people living in the property who are not the buyer. In later questions you will only be asked for details about the first 5 other people for a sole purchase."
               question_text: "Besides the buyer, how many other people live or will live in the property?"
 
           details_known_2:
diff --git a/config/locales/validations/lettings/financial.en.yml b/config/locales/validations/lettings/financial.en.yml
index f77e23e17..d91610602 100644
--- a/config/locales/validations/lettings/financial.en.yml
+++ b/config/locales/validations/lettings/financial.en.yml
@@ -24,6 +24,9 @@ en:
         ecstat:
           earnings_over_hard_max: "The household’s income of %{earnings} %{frequency} is too high given the household’s working situation."
           earnings_under_hard_min: "The household’s income of %{earnings} %{frequency} is too low given the household’s working situation."
+          part_or_full_time: "Answer cannot be ‘full-time’ or ‘part-time’ if ‘all’ household income is from Universal Credit, state pensions or benefits."
+        relat:
+          part_or_full_time: "Tenant %{person_num} cannot be the partner of tenant 1 if ‘all’ household income is from Universal Credit, state pensions or benefits and tenant %{person_num} works full-time or part-time."
         age:
           earnings_over_hard_max: "The household’s income of %{earnings} %{frequency} is too high for the number of adults. Change either the household income or the age of the tenants."
         incfreq:
diff --git a/config/locales/validations/lettings/property_information.en.yml b/config/locales/validations/lettings/property_information.en.yml
index 20fdcba94..8f706c261 100644
--- a/config/locales/validations/lettings/property_information.en.yml
+++ b/config/locales/validations/lettings/property_information.en.yml
@@ -5,6 +5,7 @@ en:
         postcode_full:
           invalid: "Enter a postcode in the correct format, for example AA1 1AA."
           not_in_england: "It looks like you have an entered a postcode outside of England. Only create logs for lettings in England."
+          la_not_valid_for_date: "%{la} does not exist on the tenancy start date, due to a change in local authority names and boundaries. Please enter the local authority name in use on the tenancy start date"
         rsnvac:
           non_temp_accommodation: "Answer cannot be re-let to tenant who occupied the same property as temporary accommodation as this accommodation is not temporary."
           referral_invalid: "Answer cannot be re-let to tenant who occupied the same property as temporary accommodation as a different source of referral for this letting."
@@ -22,17 +23,23 @@ en:
         uprn:
           invalid: "UPRN must be 12 digits or less."
           not_in_england: "It looks like you have entered an address outside of England. Only create logs for lettings in England."
-        uprn_confirmation:
+          la_not_valid_for_date: "%{la} does not exist on the tenancy start date, due to a change in local authority names and boundaries. Please enter the local authority name in use on the tenancy start date"
+        uprn_confirmation: # legacy question
           not_in_england: "It looks like you have entered an address outside of England. Only create logs for lettings in England."
         uprn_selection:
           not_in_england: "It looks like you have entered an address outside of England. Only create logs for lettings in England."
+          la_not_valid_for_date: "%{la} does not exist on the tenancy start date, due to a change in local authority names and boundaries. Please enter the local authority name in use on the tenancy start date"
         la:
           not_in_england: "It looks like you have entered an address outside of England. Only create logs for lettings in England."
+          la_not_valid_for_date: "%{la} does not exist on the tenancy start date, due to a change in local authority names and boundaries. Please enter the local authority name in use on the tenancy start date"
         scheme_id:
           not_in_england: "This scheme’s only location is outside of England. Only create logs for lettings in England."
+          la_not_valid_for_date: "%{la} does not exist on the tenancy start date, due to a change in local authority names and boundaries. Please enter the local authority name in use on the tenancy start date"
         location_id:
           not_in_england: "It looks like you have selected a location outside of England. Only create logs for lettings in England."
+          la_not_valid_for_date: "%{la} does not exist on the tenancy start date, due to a change in local authority names and boundaries. Please enter the local authority name in use on the tenancy start date"
         startdate:
           postcode_not_in_england: "It looks like you have an entered a postcode outside of England. Only create logs for lettings in England."
           address_not_in_england: "It looks like you have entered an address outside of England. Only create logs for lettings in England."
           location_not_in_england: "It looks like you have selected a location outside of England. Only create logs for lettings in England."
+          la_not_valid_for_date: "%{la} does not exist on the tenancy start date, due to a change in local authority names and boundaries. Please enter the local authority name in use on the tenancy start date"
diff --git a/config/locales/validations/sales/property_information.en.yml b/config/locales/validations/sales/property_information.en.yml
index f421177af..ec107a833 100644
--- a/config/locales/validations/sales/property_information.en.yml
+++ b/config/locales/validations/sales/property_information.en.yml
@@ -8,6 +8,7 @@ en:
             not_joint_purchase: "Buyer’s last accommodation and discounted ownership postcodes must match."
           invalid: "Enter a postcode in the correct format, for example AA1 1AA."
           not_in_england: "It looks like you have entered a postcode outside of England. Only create logs for sales in England."
+          la_not_valid_for_date: "%{la} does not exist on the property sale date, due to a change in local authority names and boundaries. Please enter the local authority name in use on the sale date"
         ppostcode_full:
           postcode_must_match_previous:
             joint_purchase: "Buyers’ last accommodation and discounted ownership postcodes must match."
@@ -22,6 +23,7 @@ en:
             not_joint_purchase: "Buyer’s last accommodation and discounted ownership postcodes must match."
           invalid: "UPRN must be 12 digits or less."
           not_in_england: "It looks like you have entered an address outside of England. Only create logs for sales in England."
+          la_not_valid_for_date: "%{la} does not exist on the property sale date, due to a change in local authority names and boundaries. Please enter the local authority name in use on the sale date"
         beds:
           bedsits_have_max_one_bedroom: "Number of bedrooms must be 1 if the property is a bedsit."
         proptype:
@@ -30,10 +32,13 @@ en:
           invalid: "You must answer UPRN known?"
         la:
           not_in_england: "It looks like you have entered an address outside of England. Only create logs for sales in England."
-        uprn_confirmation:
+          la_not_valid_for_date: "%{la} does not exist on the property sale date, due to a change in local authority names and boundaries. Please enter the local authority name in use on the sale date"
+        uprn_confirmation: # legacy question
           not_in_england: "It looks like you have entered an address outside of England. Only create logs for sales in England."
         uprn_selection:
           not_in_england: "It looks like you have entered an address outside of England. Only create logs for sales in England."
+          la_not_valid_for_date: "%{la} does not exist on the property sale date, due to a change in local authority names and boundaries. Please enter the local authority name in use on the sale date"
         saledate:
           postcode_not_in_england: "It looks like you have entered a postcode outside of England. Only create logs for sales in England."
           address_not_in_england: "It looks like you have entered an address outside of England. Only create logs for sales in England."
+          la_not_valid_for_date: "%{la} does not exist on the property sale date, due to a change in local authority names and boundaries. Please enter the local authority name in use on the sale date"
diff --git a/spec/models/validations/financial_validations_spec.rb b/spec/models/validations/financial_validations_spec.rb
index e701f12da..7e458ee28 100644
--- a/spec/models/validations/financial_validations_spec.rb
+++ b/spec/models/validations/financial_validations_spec.rb
@@ -40,6 +40,7 @@ RSpec.describe Validations::FinancialValidations do
         record.ecstat1 = 1
         financial_validator.validate_net_income_uc_proportion(record)
         expect(record.errors["benefits"]).to include(match I18n.t("validations.lettings.financial.benefits.part_or_full_time"))
+        expect(record.errors["ecstat1"]).to include(match I18n.t("validations.lettings.financial.ecstat.part_or_full_time"))
       end
 
       it "validates that the lead tenant is not in part time employment" do
@@ -47,6 +48,7 @@ RSpec.describe Validations::FinancialValidations do
         record.ecstat1 = 2
         financial_validator.validate_net_income_uc_proportion(record)
         expect(record.errors["benefits"]).to include(match I18n.t("validations.lettings.financial.benefits.part_or_full_time"))
+        expect(record.errors["ecstat1"]).to include(match I18n.t("validations.lettings.financial.ecstat.part_or_full_time"))
       end
 
       it "expects that the lead tenant is not in full-time or part-time employment" do
@@ -54,6 +56,7 @@ RSpec.describe Validations::FinancialValidations do
         record.ecstat1 = 4
         financial_validator.validate_net_income_uc_proportion(record)
         expect(record.errors["benefits"]).to be_empty
+        expect(record.errors["ecstat1"]).to be_empty
       end
 
       it "validates that the tenant’s partner is not in full time employment" do
@@ -62,6 +65,8 @@ RSpec.describe Validations::FinancialValidations do
         record.relat2 = "P"
         financial_validator.validate_net_income_uc_proportion(record)
         expect(record.errors["benefits"]).to include(match I18n.t("validations.lettings.financial.benefits.part_or_full_time"))
+        expect(record.errors["ecstat2"]).to include(match I18n.t("validations.lettings.financial.ecstat.part_or_full_time"))
+        expect(record.errors["relat2"]).to include(match I18n.t("validations.lettings.financial.relat.part_or_full_time", person_num: 2))
       end
 
       it "expects that the tenant’s partner is not in full-time or part-time employment" do
@@ -70,6 +75,8 @@ RSpec.describe Validations::FinancialValidations do
         record.relat2 = "P"
         financial_validator.validate_net_income_uc_proportion(record)
         expect(record.errors["benefits"]).to be_empty
+        expect(record.errors["ecstat2"]).to be_empty
+        expect(record.errors["relat2"]).to be_empty
       end
     end
   end
diff --git a/spec/models/validations/property_validations_spec.rb b/spec/models/validations/property_validations_spec.rb
index f4e5fe6f2..1def796dc 100644
--- a/spec/models/validations/property_validations_spec.rb
+++ b/spec/models/validations/property_validations_spec.rb
@@ -221,7 +221,6 @@ RSpec.describe Validations::PropertyValidations do
           expect(log.errors["la"]).to include(I18n.t("validations.lettings.property.la.not_in_england"))
           expect(log.errors["postcode_full"]).to include(I18n.t("validations.lettings.property.postcode_full.not_in_england"))
           expect(log.errors["uprn"]).to include(I18n.t("validations.lettings.property.uprn.not_in_england"))
-          expect(log.errors["uprn_confirmation"]).to include(I18n.t("validations.lettings.property.uprn_confirmation.not_in_england"))
           expect(log.errors["uprn_selection"]).to include(I18n.t("validations.lettings.property.uprn_selection.not_in_england"))
           expect(log.errors["startdate"]).to include(I18n.t("validations.lettings.property.startdate.postcode_not_in_england"))
           expect(log.errors["scheme_id"]).to be_empty
@@ -241,7 +240,6 @@ RSpec.describe Validations::PropertyValidations do
           expect(log.errors["la"]).to be_empty
           expect(log.errors["postcode_full"]).to be_empty
           expect(log.errors["uprn"]).to be_empty
-          expect(log.errors["uprn_confirmation"]).to be_empty
           expect(log.errors["uprn_selection"]).to be_empty
         end
       end
@@ -254,7 +252,6 @@ RSpec.describe Validations::PropertyValidations do
           expect(log.errors["la"]).to be_empty
           expect(log.errors["postcode_full"]).to be_empty
           expect(log.errors["uprn"]).to be_empty
-          expect(log.errors["uprn_confirmation"]).to be_empty
           expect(log.errors["uprn_selection"]).to be_empty
           expect(log.errors["startdate"]).to be_empty
         end
@@ -274,7 +271,97 @@ RSpec.describe Validations::PropertyValidations do
           expect(log.errors["la"]).to be_empty
           expect(log.errors["postcode_full"]).to be_empty
           expect(log.errors["uprn"]).to be_empty
-          expect(log.errors["uprn_confirmation"]).to be_empty
+          expect(log.errors["uprn_selection"]).to be_empty
+        end
+      end
+    end
+  end
+
+  describe "#validate_la_is_active" do
+    let(:la_ecode_active) { "E09000033" }
+    let(:la_ecode_inactive) { "E07000156" }
+    let(:local_authority_active) { LocalAuthority.find_by(code: la_ecode_active) }
+    let(:local_authority_inactive) { LocalAuthority.find_by(code: la_ecode_inactive) }
+
+    context "with a log on or after 2025" do
+      before do
+        allow(log.form).to receive(:start_year_2025_or_later?).and_return true
+      end
+
+      context "and the local authority is active for general needs log" do
+        let(:log) { build(:lettings_log, :completed, la: la_ecode_active, needstype: 1) }
+
+        it "does not add an error" do
+          property_validator.validate_la_is_active(log)
+          expect(log.errors["la"]).to be_empty
+          expect(log.errors["postcode_full"]).to be_empty
+          expect(log.errors["uprn"]).to be_empty
+          expect(log.errors["uprn_selection"]).to be_empty
+          expect(log.errors["startdate"]).to be_empty
+        end
+      end
+
+      context "and the local authority is inactive for general needs log" do
+        let(:log) { build(:lettings_log, :completed, la: la_ecode_inactive, needstype: 1) }
+
+        it "adds an error" do
+          property_validator.validate_la_is_active(log)
+          expect(log.errors["la"]).to include(I18n.t("validations.lettings.property.la.la_not_valid_for_date", la: local_authority_inactive.name))
+          expect(log.errors["postcode_full"]).to include(I18n.t("validations.lettings.property.postcode_full.la_not_valid_for_date", la: local_authority_inactive.name))
+          expect(log.errors["uprn"]).to include(I18n.t("validations.lettings.property.uprn.la_not_valid_for_date", la: local_authority_inactive.name))
+          expect(log.errors["uprn_selection"]).to include(I18n.t("validations.lettings.property.uprn_selection.la_not_valid_for_date", la: local_authority_inactive.name))
+          expect(log.errors["startdate"]).to include(I18n.t("validations.lettings.property.startdate.la_not_valid_for_date", la: local_authority_inactive.name))
+          expect(log.errors["scheme_id"]).to be_empty
+          expect(log.errors["location_id"]).to be_empty
+        end
+      end
+
+      context "and the local authority is active for supported housing log" do
+        let(:location) { create(:location, location_code: la_ecode_active) }
+        let(:log) { build(:lettings_log, :completed, needstype: 2, location:) }
+
+        it "does not add an error" do
+          property_validator.validate_la_is_active(log)
+          expect(log.errors["scheme_id"]).to be_empty
+          expect(log.errors["location_id"]).to be_empty
+          expect(log.errors["startdate"]).to be_empty
+          expect(log.errors["la"]).to be_empty
+          expect(log.errors["postcode_full"]).to be_empty
+          expect(log.errors["uprn"]).to be_empty
+          expect(log.errors["uprn_selection"]).to be_empty
+        end
+      end
+
+      context "and the local authority is inactive for supported housing log" do
+        let(:location) { create(:location, location_code: la_ecode_inactive) }
+        let(:log) { build(:lettings_log, :completed, needstype: 2, location:) }
+
+        it "adds an error" do
+          property_validator.validate_la_is_active(log)
+          expect(log.errors["scheme_id"]).to include(I18n.t("validations.lettings.property.scheme_id.la_not_valid_for_date", la: local_authority_inactive.name))
+          expect(log.errors["location_id"]).to include(I18n.t("validations.lettings.property.location_id.la_not_valid_for_date", la: local_authority_inactive.name))
+          expect(log.errors["startdate"]).to include(I18n.t("validations.lettings.property.startdate.la_not_valid_for_date", la: local_authority_inactive.name))
+          expect(log.errors["la"]).to be_empty
+          expect(log.errors["postcode_full"]).to be_empty
+          expect(log.errors["uprn"]).to be_empty
+          expect(log.errors["uprn_selection"]).to be_empty
+        end
+      end
+    end
+
+    context "with a log before 2025" do
+      before do
+        allow(log.form).to receive(:start_year_2025_or_later?).and_return false
+      end
+
+      context "and the local authority is inactive" do
+        let(:log) { build(:lettings_log, :completed, la: la_ecode_inactive) }
+
+        it "does not add an error" do
+          property_validator.validate_la_is_active(log)
+          expect(log.errors["la"]).to be_empty
+          expect(log.errors["postcode_full"]).to be_empty
+          expect(log.errors["uprn"]).to be_empty
           expect(log.errors["uprn_selection"]).to be_empty
         end
       end
diff --git a/spec/models/validations/sales/property_validations_spec.rb b/spec/models/validations/sales/property_validations_spec.rb
index ce6585956..e46f58f84 100644
--- a/spec/models/validations/sales/property_validations_spec.rb
+++ b/spec/models/validations/sales/property_validations_spec.rb
@@ -98,7 +98,6 @@ RSpec.describe Validations::Sales::PropertyValidations do
           expect(log.errors["la"]).to include(I18n.t("validations.sales.property_information.la.not_in_england"))
           expect(log.errors["postcode_full"]).to include(I18n.t("validations.sales.property_information.postcode_full.not_in_england"))
           expect(log.errors["uprn"]).to include(I18n.t("validations.sales.property_information.uprn.not_in_england"))
-          expect(log.errors["uprn_confirmation"]).to include(I18n.t("validations.sales.property_information.uprn_confirmation.not_in_england"))
           expect(log.errors["uprn_selection"]).to include(I18n.t("validations.sales.property_information.uprn_selection.not_in_england"))
           expect(log.errors["saledate"]).to include(I18n.t("validations.sales.property_information.saledate.postcode_not_in_england"))
         end
@@ -112,7 +111,6 @@ RSpec.describe Validations::Sales::PropertyValidations do
           expect(log.errors["la"]).to be_empty
           expect(log.errors["postcode_full"]).to be_empty
           expect(log.errors["uprn"]).to be_empty
-          expect(log.errors["uprn_confirmation"]).to be_empty
           expect(log.errors["uprn_selection"]).to be_empty
           expect(log.errors["saledate"]).to be_empty
         end
@@ -132,7 +130,64 @@ RSpec.describe Validations::Sales::PropertyValidations do
           expect(log.errors["la"]).to be_empty
           expect(log.errors["postcode_full"]).to be_empty
           expect(log.errors["uprn"]).to be_empty
-          expect(log.errors["uprn_confirmation"]).to be_empty
+          expect(log.errors["uprn_selection"]).to be_empty
+          expect(log.errors["saledate"]).to be_empty
+        end
+      end
+    end
+  end
+
+  describe "#validate_la_is_active" do
+    let(:la_ecode_active) { "E09000033" }
+    let(:la_ecode_inactive) { "E07000156" }
+    let(:local_authority_active) { LocalAuthority.find_by(code: la_ecode_active) }
+    let(:local_authority_inactive) { LocalAuthority.find_by(code: la_ecode_inactive) }
+
+    context "with a log on or after 2025" do
+      before do
+        allow(log.form).to receive(:start_year_2025_or_later?).and_return true
+      end
+
+      context "and the local authority is active" do
+        let(:log) { build(:sales_log, :completed, la: la_ecode_active) }
+
+        it "adds an error" do
+          property_validator.validate_la_is_active(log)
+          expect(log.errors["la"]).to be_empty
+          expect(log.errors["postcode_full"]).to be_empty
+          expect(log.errors["uprn"]).to be_empty
+          expect(log.errors["uprn_selection"]).to be_empty
+          expect(log.errors["saledate"]).to be_empty
+        end
+      end
+
+      context "and the local authority is inactive" do
+        let(:log) { build(:sales_log, :completed, la: la_ecode_inactive) }
+
+        it "does not add an error" do
+          property_validator.validate_la_is_active(log)
+          expect(log.errors["la"]).to include(I18n.t("validations.sales.property_information.la.la_not_valid_for_date", la: local_authority_inactive.name))
+          expect(log.errors["postcode_full"]).to include(I18n.t("validations.sales.property_information.postcode_full.la_not_valid_for_date", la: local_authority_inactive.name))
+          expect(log.errors["uprn"]).to include(I18n.t("validations.sales.property_information.uprn.la_not_valid_for_date", la: local_authority_inactive.name))
+          expect(log.errors["uprn_selection"]).to include(I18n.t("validations.sales.property_information.uprn_selection.la_not_valid_for_date", la: local_authority_inactive.name))
+          expect(log.errors["saledate"]).to include(I18n.t("validations.sales.property_information.saledate.la_not_valid_for_date", la: local_authority_inactive.name))
+        end
+      end
+    end
+
+    context "with a log before 2025" do
+      before do
+        allow(log.form).to receive(:start_year_2025_or_later?).and_return false
+      end
+
+      context "and the local authority is inactive" do
+        let(:log) { build(:sales_log, :completed, la: la_ecode_inactive) }
+
+        it "does not add an error" do
+          property_validator.validate_la_is_active(log)
+          expect(log.errors["la"]).to be_empty
+          expect(log.errors["postcode_full"]).to be_empty
+          expect(log.errors["uprn"]).to be_empty
           expect(log.errors["uprn_selection"]).to be_empty
           expect(log.errors["saledate"]).to be_empty
         end
diff --git a/yarn.lock b/yarn.lock
index 5b3865609..3f4d331e5 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3172,9 +3172,9 @@ jest-worker@^27.4.5:
   integrity sha512-RdJUflcE3cUzKiMqQgsCu06FPu9UdIJO0beYbPhHN4k6apgJtifcoCtT9bcxOpYBtpD2kCM6Sbzg4CausW/PKQ==
 
 js-yaml@^4.1.0:
-  version "4.1.0"
-  resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-4.1.0.tgz#c1fb65f8f5017901cdd2c951864ba18458a10602"
-  integrity sha512-wpxZs9NoxZaJESJGIZTyDEaYpl0FKSA+FB9aJiyemKhMwkxQg63h4T1KJgUGHpTqPDNRcmmYLugrRjJlBtWvRA==
+  version "4.1.1"
+  resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-4.1.1.tgz#854c292467705b699476e1a2decc0c8a3458806b"
+  integrity sha512-qQKT4zQxXl8lLwBtHMWwaTcGfFOZviOJet3Oy/xmGk2gZH677CJM9EvtfdSkgWcATZhj/55JZ0rmy3myCT5lsA==
   dependencies:
     argparse "^2.0.1"