GTI Engineering

I'm driving what I believe to be a rare beast, a GTI Engineering modified '85 Cabbie.
She's in great running condition, bored out to 2L and very very nippy. Half leather, with various GTI Eng bits.
Does anyone know how many of these there are on the road, and what I should aim to sell it for?
Yzzidog

Any pics?

have you sold this?