Apply suggestion from @thomasiles

Co-authored-by: Thomas Iles <tom.iles@digital.cabinet-office.gov.uk>

Author: DavidBiddle

app/controllers/forms/base_controller.rb

@@ -49,7 +49,17 @@ def set_form
 
       if @form.blank?
         I18n.with_locale(locale) do
-          return render template: "forms/archived_welsh/show", locals: { form: live_english_version(form_id) }, status: :not_found if archived_welsh_version_with_live_english_form?(form_id)
+          if locale == "cy"
+            archived_welsh = Api::V2::FormDocumentRepository.find(form_id:, tag: :archived, language: :cy)
+            live_english = Api::V2::FormDocumentRepository.find(form_id:, tag: :live, language: :en)
+
+            if archived_welsh.present? && live_english.present?
+              return render template: "forms/archived_welsh/show",
+                            locals: { form: live_english },
+                            status: :not_found
+            end
+          end
+
 
           archived_form = Api::V2::FormDocumentRepository.find(form_id:, tag: :archived)
           return render template: "forms/archived/show", locals: { form_name: archived_form.name }, status: :not_found if archived_form.present?