Difficult image to be sure, but I think it's the legendary Rapier H120. Biggest clue is the badge position low down - normal Rapier and Alpine were higher up on the slanted edge. Boot outline looks more like the H120 spoiler, and there's no sign of normal Rapier or Alpine trim strips. However no H120 side tapes, but there is at least one white H120 without them - CRU 800L is Nov 72 plate, although it would be stretching things a bit too far to say this is definitely that exact car.