Well I can say with a high degree of confidence that it's the same car I've been offered that's pictured above, only it's on a different reg now (s1 rst v5).

Not spoken to the seller yet but since the car is pretty much one of a kind in terms of the carb kit it's highly unlikely it has a twin with the same wheels, and stainless tanks etc etc.

Anyway, not got to ruin this post with trial by internet, I'll ask a few more questions but probably walk away as it's not looking very promising.