Yimkin | Clive Puzey | Brands Hatch

A nice drivers side shot of Clive Puzey racing the Yimkin Formula Junior during the Trio Meeting at Brands Hatch. Note the front wheel is about to come off. Care of the 750 Motor Club Bulletin. The credits for the photo are Studio 3, 5/39 Brixton Hill, SW2. Does anyone know more about them in period?