Hi Alex
Your car has a Speedwell "Monza" nose and a Lenham Coupe rear - the Lenham Coupe rear is very rare and was Lenham's initial design to go on the Frogeye and has no rear windows. They subsequently made the Lenham Le Mans rear which was designed for the Mk II Sprite / Mk I Midget onwards, and which does have rear windows (this is the Lenham style most people know).
There was a similar car at Spridget 50 at Gaydon with a Lenham Coupe rear, but with the matching Lenham nose, and there is also the infamous FLY, a heavily modified Lenham Coupe with W&P Sebring GT nose and a pretty wild Cosworth crossflow engine that was converted in the late 60s, and was well known on the mod scene and documented in several period magazines before it was shipped to Australia circa 1971, where it still survives.
Tim Saunders
Registrar, W&P Sebring GT Register