Geoff Byman had a company in that hotbed of British engineering - Grimsby. This is probably Mallory Park and not Cadwell Park, as I first posted, as I do have a slide with the car running that same number.
That isn't Geoff lubricating his innards with a pint of the local brew. This is Geoff's later race car as opposed to his rally and sprint car. His speciality was cylinder heads and he did some quite advanced work regarding inclined inlets. His crew also did a sterling job patching up my car in 1971, at Silverstone, after I'd piled into the wall at Woodcote, having hit a patch of damp when turning in. So ended my first season of competition - a Mini Cooper with a very bent left front.