If I may take a moment to update the information on this 'enigma'.....
The car was built by Whitley Sports Cars of Great Yeldham, Essex in 1999. The man behind it was Ian McDonald, a classic car restorer. Apparently 2 were built but only made one appearance at the Stoneleigh Show in 1999 in unfinished condition.
Technically the car was quite sophisticated with a spaceframe chassis and unmodified MacPherson strut rear end plus other Ford Sierra parts.
The Enigma had a Cobra-inspired rear section that could be unbolted to allow an alternative coupe body to be fitted.
A front view of the car appears in Steve Hole's A-Z of Kitcars book.