Update link

app/services/bulk_upload/lettings/validator.rb

@@ -1,5 +1,6 @@
 class BulkUpload::Lettings::Validator
   include ActiveModel::Validations
+  include Rails.application.routes.url_helpers
 
   attr_reader :bulk_upload, :path
 
@@ -180,7 +181,7 @@ private
     return if halt_validations?
 
     if csv_parser.missing_required_headers?
-      errors.add :base, I18n.t("activemodel.errors.models.bulk_upload/lettings/validator.attributes.base.no_headers", guidance_link: "https://#{ENV['APP_HOST']}/lettings-logs/bulk-upload-logs/guidance?form%5Byear%5D=#{bulk_upload.year}#using-the-bulk-upload-template")
+      errors.add :base, I18n.t("activemodel.errors.models.bulk_upload/lettings/validator.attributes.base.no_headers", guidance_link: bulk_upload_lettings_log_url(id: "guidance", form: { year: bulk_upload.year }, host: ENV["APP_HOST"], anchor: "using-the-bulk-upload-template"))
       halt_validations!
     end
   end

app/services/bulk_upload/sales/validator.rb

@@ -1,5 +1,6 @@
 class BulkUpload::Sales::Validator
   include ActiveModel::Validations
+  include Rails.application.routes.url_helpers
 
   attr_reader :bulk_upload, :path
 
@@ -164,7 +165,7 @@ private
     return if halt_validations?
 
     if csv_parser.missing_required_headers?
-      errors.add :base, I18n.t("activemodel.errors.models.bulk_upload/sales/validator.attributes.base.no_headers", guidance_link: "https://#{ENV['APP_HOST']}/sales-logs/bulk-upload-logs/guidance?form%5Byear%5D=#{bulk_upload.year}#using-the-bulk-upload-template")
+      errors.add :base, I18n.t("activemodel.errors.models.bulk_upload/sales/validator.attributes.base.no_headers", guidance_link: bulk_upload_sales_log_url(id: "guidance", form: { year: bulk_upload.year }, host: ENV["APP_HOST"], anchor: "using-the-bulk-upload-template"))
       halt_validations!
     end
   end