Interestingly, although Bentley-modifier Mallalieu acquired the rights to build the Microdot, they never actually got around to building a complete one, as they went bust before the first car was finished.
Your photo looks like it was taken at one of the great kit car shows that William Towns used to host in the garden of his extensive grounds in Kineton, Warwickshire. In the backgound is one of his many Hustler variants, plus his legendary six-wheeled GMC camper, which he had resprayed in the distinctive Aston Martin pale green metallic that he painted many of his cars in. Oh, the nostalgia!