I'm speechless! I've been searching for a photograph of a Watling for years with no success, so seeing this has really made my day - thank you!
anyway, to complete the answer and fill in some details, Watlings were made in Parkstreet Villiage, St.Albans between 1959-61 by the Watling Cars company, who were a subsidiary of a larger firm who produced glassfibre caravans, speedboats and baths amongst other glassfibre products.
The cars were available in four basic body styles, a long-nosed version (the puzzle car is one of these) and a short-nosed version, either as open convertible or closed coupe. They were mounted on thier own unique ladderframe chassis and used Morris Minor front suspension and the engines were usually Ford (Anglia, 100E or Ten) or BMC A-series. Approx. 200 were built, but as far as I know there are no roadworthy survivors.