diff --git a/app/models/form/lettings/pages/lead_tenant_sex_registered_at_birth1.rb b/app/models/form/lettings/pages/lead_tenant_sex_registered_at_birth.rb
similarity index 79%
rename from app/models/form/lettings/pages/lead_tenant_sex_registered_at_birth1.rb
rename to app/models/form/lettings/pages/lead_tenant_sex_registered_at_birth.rb
index 2e80bf598..c7d8c76b6 100644
--- a/app/models/form/lettings/pages/lead_tenant_sex_registered_at_birth1.rb
+++ b/app/models/form/lettings/pages/lead_tenant_sex_registered_at_birth.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class Form::Lettings::Pages::LeadTenantSexRegisteredAtBirth1 < ::Form::Page
+class Form::Lettings::Pages::LeadTenantSexRegisteredAtBirth < ::Form::Page
   def initialize(id, hsh, subsection)
     super
     @id = "lead_tenant_sex_registered_at_birth"
diff --git a/app/models/form/lettings/subsections/household_characteristics.rb b/app/models/form/lettings/subsections/household_characteristics.rb
index f38d72e98..b40e1f746 100644
--- a/app/models/form/lettings/subsections/household_characteristics.rb
+++ b/app/models/form/lettings/subsections/household_characteristics.rb
@@ -17,6 +17,7 @@ class Form::Lettings::Subsections::HouseholdCharacteristics < ::Form::Subsection
       Form::Lettings::Pages::FemalesInSoftAgeRangeInPregnantHouseholdLeadAgeValueCheck.new(nil, nil, self),
       Form::Lettings::Pages::LeadTenantUnderRetirementValueCheck.new("age_lead_tenant_under_retirement_value_check", nil, self),
       Form::Lettings::Pages::LeadTenantOverRetirementValueCheck.new("age_lead_tenant_over_retirement_value_check", nil, self),
+      (Form::Lettings::Pages::LeadTenantSexRegisteredAtBirth.new(nil, nil, self) if form.start_year_2026_or_later?),
       Form::Lettings::Pages::LeadTenantGenderIdentity.new(nil, nil, self),
       Form::Lettings::Pages::NoFemalesPregnantHouseholdLeadValueCheck.new(nil, nil, self),
       Form::Lettings::Pages::FemalesInSoftAgeRangeInPregnantHouseholdLeadValueCheck.new(nil, nil, self),
@@ -44,6 +45,7 @@ class Form::Lettings::Subsections::HouseholdCharacteristics < ::Form::Subsection
       Form::Lettings::Pages::PersonUnderRetirementValueCheck.new("age_2_under_retirement_value_check", nil, self, person_index: 2),
       Form::Lettings::Pages::PersonOverRetirementValueCheck.new("age_2_over_retirement_value_check", nil, self, person_index: 2),
       (Form::Lettings::Pages::PartnerUnder16ValueCheck.new("age_2_partner_under_16_value_check", nil, self, person_index: 2) if form.start_year_2024_or_later? && !form.start_year_2026_or_later?),
+      (Form::Lettings::Pages::PersonSexRegisteredAtBirth.new(nil, nil, self, person_index: 2) if form.start_year_2026_or_later? && !form.start_year_2026_or_later?),
       Form::Lettings::Pages::PersonGenderIdentity.new(nil, nil, self, person_index: 2),
       Form::Lettings::Pages::NoFemalesPregnantHouseholdPersonValueCheck.new(nil, nil, self, person_index: 2),
       Form::Lettings::Pages::FemalesInSoftAgeRangeInPregnantHouseholdPersonValueCheck.new(nil, nil, self,
@@ -65,6 +67,7 @@ class Form::Lettings::Subsections::HouseholdCharacteristics < ::Form::Subsection
       Form::Lettings::Pages::PersonUnderRetirementValueCheck.new("age_3_under_retirement_value_check", nil, self, person_index: 3),
       Form::Lettings::Pages::PersonOverRetirementValueCheck.new("age_3_over_retirement_value_check", nil, self, person_index: 3),
       (Form::Lettings::Pages::PartnerUnder16ValueCheck.new("age_3_partner_under_16_value_check", nil, self, person_index: 3) if form.start_year_2024_or_later? && !form.start_year_2026_or_later?),
+      (Form::Lettings::Pages::PersonSexRegisteredAtBirth.new(nil, nil, self, person_index: 3) if form.start_year_2026_or_later? && !form.start_year_2026_or_later?),
       Form::Lettings::Pages::PersonGenderIdentity.new(nil, nil, self, person_index: 3),
       Form::Lettings::Pages::NoFemalesPregnantHouseholdPersonValueCheck.new(nil, nil, self, person_index: 3),
       Form::Lettings::Pages::FemalesInSoftAgeRangeInPregnantHouseholdPersonValueCheck.new(nil, nil, self,
@@ -86,6 +89,7 @@ class Form::Lettings::Subsections::HouseholdCharacteristics < ::Form::Subsection
       Form::Lettings::Pages::PersonUnderRetirementValueCheck.new("age_4_under_retirement_value_check", nil, self, person_index: 4),
       Form::Lettings::Pages::PersonOverRetirementValueCheck.new("age_4_over_retirement_value_check", nil, self, person_index: 4),
       (Form::Lettings::Pages::PartnerUnder16ValueCheck.new("age_4_partner_under_16_value_check", nil, self, person_index: 4) if form.start_year_2024_or_later? && !form.start_year_2026_or_later?),
+      (Form::Lettings::Pages::PersonSexRegisteredAtBirth.new(nil, nil, self, person_index: 4) if form.start_year_2026_or_later? && !form.start_year_2026_or_later?),
       Form::Lettings::Pages::PersonGenderIdentity.new(nil, nil, self, person_index: 4),
       Form::Lettings::Pages::NoFemalesPregnantHouseholdPersonValueCheck.new(nil, nil, self, person_index: 4),
       Form::Lettings::Pages::FemalesInSoftAgeRangeInPregnantHouseholdPersonValueCheck.new(nil, nil, self,
@@ -107,6 +111,7 @@ class Form::Lettings::Subsections::HouseholdCharacteristics < ::Form::Subsection
       Form::Lettings::Pages::PersonUnderRetirementValueCheck.new("age_5_under_retirement_value_check", nil, self, person_index: 5),
       Form::Lettings::Pages::PersonOverRetirementValueCheck.new("age_5_over_retirement_value_check", nil, self, person_index: 5),
       (Form::Lettings::Pages::PartnerUnder16ValueCheck.new("age_5_partner_under_16_value_check", nil, self, person_index: 5) if form.start_year_2024_or_later? && !form.start_year_2026_or_later?),
+      (Form::Lettings::Pages::PersonSexRegisteredAtBirth.new(nil, nil, self, person_index: 5) if form.start_year_2026_or_later? && !form.start_year_2026_or_later?),
       Form::Lettings::Pages::PersonGenderIdentity.new(nil, nil, self, person_index: 5),
       Form::Lettings::Pages::NoFemalesPregnantHouseholdPersonValueCheck.new(nil, nil, self, person_index: 5),
       Form::Lettings::Pages::FemalesInSoftAgeRangeInPregnantHouseholdPersonValueCheck.new(nil, nil, self,
@@ -128,6 +133,7 @@ class Form::Lettings::Subsections::HouseholdCharacteristics < ::Form::Subsection
       Form::Lettings::Pages::PersonUnderRetirementValueCheck.new("age_6_under_retirement_value_check", nil, self, person_index: 6),
       Form::Lettings::Pages::PersonOverRetirementValueCheck.new("age_6_over_retirement_value_check", nil, self, person_index: 6),
       (Form::Lettings::Pages::PartnerUnder16ValueCheck.new("age_6_partner_under_16_value_check", nil, self, person_index: 6) if form.start_year_2024_or_later? && !form.start_year_2026_or_later?),
+      (Form::Lettings::Pages::PersonSexRegisteredAtBirth.new(nil, nil, self, person_index: 6) if form.start_year_2026_or_later? && !form.start_year_2026_or_later?),
       Form::Lettings::Pages::PersonGenderIdentity.new(nil, nil, self, person_index: 6),
       Form::Lettings::Pages::NoFemalesPregnantHouseholdPersonValueCheck.new(nil, nil, self, person_index: 6),
       Form::Lettings::Pages::FemalesInSoftAgeRangeInPregnantHouseholdPersonValueCheck.new(nil, nil, self,
@@ -149,6 +155,7 @@ class Form::Lettings::Subsections::HouseholdCharacteristics < ::Form::Subsection
       Form::Lettings::Pages::PersonUnderRetirementValueCheck.new("age_7_under_retirement_value_check", nil, self, person_index: 7),
       Form::Lettings::Pages::PersonOverRetirementValueCheck.new("age_7_over_retirement_value_check", nil, self, person_index: 7),
       (Form::Lettings::Pages::PartnerUnder16ValueCheck.new("age_7_partner_under_16_value_check", nil, self, person_index: 7) if form.start_year_2024_or_later? && !form.start_year_2026_or_later?),
+      (Form::Lettings::Pages::PersonSexRegisteredAtBirth.new(nil, nil, self, person_index: 7) if form.start_year_2026_or_later? && !form.start_year_2026_or_later?),
       Form::Lettings::Pages::PersonGenderIdentity.new(nil, nil, self, person_index: 7),
       Form::Lettings::Pages::NoFemalesPregnantHouseholdPersonValueCheck.new(nil, nil, self, person_index: 7),
       Form::Lettings::Pages::FemalesInSoftAgeRangeInPregnantHouseholdPersonValueCheck.new(nil, nil, self,
@@ -170,6 +177,7 @@ class Form::Lettings::Subsections::HouseholdCharacteristics < ::Form::Subsection
       Form::Lettings::Pages::PersonUnderRetirementValueCheck.new("age_8_under_retirement_value_check", nil, self, person_index: 8),
       Form::Lettings::Pages::PersonOverRetirementValueCheck.new("age_8_over_retirement_value_check", nil, self, person_index: 8),
       (Form::Lettings::Pages::PartnerUnder16ValueCheck.new("age_8_partner_under_16_value_check", nil, self, person_index: 8) if form.start_year_2024_or_later? && !form.start_year_2026_or_later?),
+      (Form::Lettings::Pages::PersonSexRegisteredAtBirth.new(nil, nil, self, person_index: 8) if form.start_year_2026_or_later? && !form.start_year_2026_or_later?),
       Form::Lettings::Pages::PersonGenderIdentity.new(nil, nil, self, person_index: 8),
       Form::Lettings::Pages::NoFemalesPregnantHouseholdPersonValueCheck.new(nil, nil, self, person_index: 8),
       Form::Lettings::Pages::FemalesInSoftAgeRangeInPregnantHouseholdPersonValueCheck.new(nil, nil, self,