feat: add sales guidance methods

app/models/forms/bulk_upload_lettings/guidance.rb

@@ -39,8 +39,8 @@ module Forms
         Forms::BulkUploadSales::PrepareYourFile.new(year:).specification_path
       end
 
-      def download_text(lettings_or_sales, file, new_or_legacy=nil)
-        "Download the #{lettings_or_sales} bulk upload #{file} (#{year_combo_full})#{new_or_legacy_text(new_or_legacy) if year == 2023 and new_or_legacy.present?}"
+      def download_text(lettings_or_sales, file, new_or_legacy = nil)
+        "Download the #{lettings_or_sales} bulk upload #{file} (#{year_combo_full})#{new_or_legacy_text(new_or_legacy) if (year == 2023) && new_or_legacy.present?}"
       end
 
       def year_combo

app/models/forms/bulk_upload_sales/guidance.rb

@@ -38,6 +38,25 @@ module Forms
       def sales_specification_path
         Forms::BulkUploadSales::PrepareYourFile.new(year:).specification_path
       end
+
+      def download_text(lettings_or_sales, file, new_or_legacy = nil)
+        "Download the #{lettings_or_sales} bulk upload #{file} (#{year_combo_full})#{new_or_legacy_text(new_or_legacy) if (year == 2023) && new_or_legacy.present?}"
+      end
+
+      def year_combo
+        "#{year}/#{year - 2000 + 1}"
+      end
+
+      def year_combo_full
+        "#{year} to #{year + 1}"
+      end
+
+      def new_or_legacy_text(new_or_legacy)
+        case new_or_legacy
+        when "new" then " – New question ordering"
+        when "legacy" then " – Legacy version"
+        end
+      end
     end
   end
 end