def fields_for record_name, record_object = nil, fields_options = {}, &block
      super record_name, record_object, fields_options.merge(builder: self.class), &block
    end
def fields_for record_name, record_object = nil, fields_options = {}, &block
      super record_name, record_object, fields_options.merge(builder: self.class), &block
    end
Ensure fields_for yields a GovukElementsFormBuilder.