Formula Mini Plus (or FMP) is what I was after.
"Biota Formula Mini Plus, or FMP. It was actually named Formula Mini Plus, or FMP, and the idea came from Biota instigator John Houghton. Houghton had been racing in a Hot Car sponsored Midget competition with a home grown Mini based car that he'd christened 'The Black Lawnmawer' with some success. It sparked the idea for a race class with more like minded. A prototype race car was built up around a 90bhp A series engine in its Mini subframe at the front, coupled to a simple chassis with four fibreglass body sections. Things looked good for low cost racing and Houghton offered replica's for budding race drivers. But negotations with RAC Competitions Department lead to nothing and the class was banned from racing before it ever hit the tracks. This was 1971"
Since Oswald got the builder a point for each of you.