GJA714N ERF/ERF WrL GMCmid 1970s Stockport I think originally then GMC - there are images on internet saying Kerbell bodywork but I think this is wrong. This looks like classic ERF/Jennings bodywork to me. Stockport borough did have some Kerbell bodied appliances.
Late Alastair Collins collection - used with permission.
Picture added on 04 February 2020 at 10:00