Add BU handling

app/models/derived_variables/lettings_log_variables.rb

@@ -188,7 +188,7 @@ module DerivedVariables::LettingsLogVariables
       self.uprn_selection = nil
       self.postcode_known = nil
       self.manual_address_entry_selected = nil
-      location_la = location&.linked_local_authorities&.active(form.start_date)&.first&.code || location&.location_code
+      location_la = location_derived_la
       if location_la.present?
         self.la = location_la
         self.is_la_inferred = true

app/models/lettings_log.rb

@@ -228,7 +228,7 @@ class LettingsLog < Log
     return super unless location
     return super if form.start_year_2026_or_later? && super
 
-    location.linked_local_authorities.active(form.start_date).first&.code || location.location_code
+    location_derived_la
   end
 
   def postcode_full
@@ -849,6 +849,12 @@ class LettingsLog < Log
 
 private
 
+  def location_derived_la
+    return unless location
+
+    location.linked_local_authorities.active(form.start_date).first&.code || location.location_code
+  end
+
   def reset_invalid_unresolved_log_fields!
     return unless unresolved?
 

app/services/bulk_upload/lettings/year2026/row_parser.rb

@@ -493,8 +493,8 @@ class BulkUpload::Lettings::Year2026::RowParser
   validate :validate_assigned_to_when_support, on: :after_log
   validate :validate_all_charges_given, on: :after_log
 
-  validate :validate_uprn_exists_if_any_key_address_fields_are_blank, on: :after_log
-  validate :validate_address_fields, on: :after_log
+  validate :validate_uprn_exists_if_any_key_address_fields_are_blank, on: :after_log, unless: :scheme_has_confidential_information?
+  validate :validate_address_fields, on: :after_log, unless: :scheme_has_confidential_information?
 
   validate :validate_nationality, on: :after_log
   validate :validate_reasonpref_reason_values, on: :after_log
@@ -1491,6 +1491,10 @@ private
 
     attributes["first_time_property_let_as_social_housing"] = first_time_property_let_as_social_housing
 
+    # For a confidential scheme, the address and UPRN fields in the BU are ignored:
+    # they are left null and the local authority is instead derived from the
+    # scheme's location in LettingsLog#set_derived_fields!.
+    unless scheme_has_confidential_information?
       attributes["uprn_known"] = field_18.present? ? 1 : 0
       attributes["uprn_confirmed"] = 1 if field_18.present?
       attributes["skip_update_uprn_confirmed"] = true
@@ -1511,6 +1515,7 @@ private
       attributes["address_line1_input"] = address_line1_input
       attributes["postcode_full_input"] = postcode_full
       attributes["select_best_address_match"] = true if field_18.blank?
+    end
 
     attributes["gender_same_as_sex1"] = field_43
     attributes["gender_description1"] = field_44
@@ -1583,6 +1588,10 @@ private
     @location ||= scheme.locations.find_by_id_on_multiple_fields(field_6)
   end
 
+  def scheme_has_confidential_information?
+    scheme&.sensitive == "Yes"
+  end
+
   def startdate
     year = field_10.to_s.strip.length.between?(1, 2) ? field_10 + 2000 : field_10
     Date.new(year, field_9, field_8) if field_10.present? && field_9.present? && field_8.present?

spec/models/lettings_log_derived_fields_spec.rb

@@ -1688,6 +1688,36 @@ RSpec.describe LettingsLog, type: :model do
     end
   end
 
+  describe "address behaviour for a non-confidential supported housing log continues as normal", metadata: { year: 26 } do
+    let(:startdate) { collection_start_date_for_year(2026) }
+    let(:non_confidential_scheme) { create(:scheme, sensitive: 0) }
+    let(:location) { create(:location, scheme: non_confidential_scheme) }
+
+    around do |example|
+      Timecop.freeze(collection_start_date_for_year(2026)) do
+        Singleton.__init__(FormHandler)
+        example.run
+      end
+    end
+
+    before do
+      log.needstype = 2
+      log.scheme = non_confidential_scheme
+      log.location = location
+    end
+
+    it "still asks for the address or UPRN" do
+      expect(log.is_address_asked?).to be true
+    end
+
+    it "routes a new-build property down the manual address entry route" do
+      log.assign_attributes(manual_address_entry_selected: false, rsnvac: 15, uprn: nil)
+
+      expect { log.set_derived_fields! }
+        .to change(log, :manual_address_entry_selected).from(false).to(true)
+    end
+  end
+
   describe "#infer_at_most_one_relationship!" do
     context "when 2025", metadata: { year: 25 } do
       before do

spec/services/bulk_upload/lettings/year2026/row_parser_spec.rb

@@ -1864,6 +1864,71 @@ RSpec.describe BulkUpload::Lettings::Year2026::RowParser do
       end
     end
 
+    describe "UPRN and address fields for a supported housing log in a confidential scheme" do
+      let(:scheme) { create(:scheme, :with_old_visible_id, owning_organisation: owning_org, sensitive: 1) }
+      let(:base_attributes) do
+        setup_section_params.merge({
+          field_4: 2,
+          field_5: "S#{scheme.id}",
+          field_6: location.old_visible_id,
+        })
+      end
+
+      context "when no UPRN or address fields are provided" do
+        let(:attributes) { base_attributes.merge({ field_18: nil, field_19: nil, field_21: nil, field_23: nil, field_24: nil }) }
+
+        it "does not require the address or UPRN (no not answered errors)" do
+          parser.valid?
+          %i[field_18 field_19 field_21 field_23 field_24].each do |field|
+            expect(parser.errors[field]).to be_empty
+          end
+        end
+
+        it "does not import any address or UPRN fields" do
+          log = parser.log
+          log.valid?
+          expect(log.read_attribute(:uprn)).to be_nil
+          expect(log.read_attribute(:address_line1)).to be_nil
+          expect(log.read_attribute(:town_or_city)).to be_nil
+          expect(log.read_attribute(:postcode_full)).to be_nil
+        end
+
+        it "derives the local authority from the scheme's location" do
+          log = parser.log
+          log.valid?
+          expect(log.read_attribute(:la)).to eq(location.location_code)
+          expect(log.is_la_inferred).to be true
+        end
+      end
+
+      context "when address and UPRN fields are provided in the template" do
+        let(:attributes) do
+          base_attributes.merge({
+            field_18: "123456789012",
+            field_19: "1 Test Street",
+            field_21: "Testville",
+            field_23: postcode_first_part,
+            field_24: postcode_second_part,
+            field_25: "E09000008",
+          })
+        end
+
+        it "ignores them and does not import the address or UPRN fields" do
+          log = parser.log
+          log.valid?
+          expect(log.read_attribute(:uprn)).to be_nil
+          expect(log.read_attribute(:address_line1)).to be_nil
+          expect(log.read_attribute(:postcode_full)).to be_nil
+        end
+
+        it "still derives the local authority from the scheme's location, ignoring the template LA" do
+          log = parser.log
+          log.valid?
+          expect(log.read_attribute(:la)).to eq(location.location_code)
+        end
+      end
+    end
+
     describe "#field_17" do # unitletas
       context "when no longer a valid option from previous year" do
         let(:attributes) { setup_section_params.merge({ field_17: "4" }) }