Some time ago I came across what I think was a 4/4 'speedster' at Williams. I describe it as a speedster as it had no screen. It was on aero screens and had no rear panel only a round swage line where one might have had a spare wheel. I see it was on a 16 plate and I saw it in 2021. Internet check confirms it was a 4/4 first reg 2016. Orange with black trim, black wires and mesh grill with headlamp surrounds in black.
Presumably a special build as not fixings for windscreen.