I love these - great cars. And very rare... which makes it very hard to value. It sounds like it's in good condition, but you don't mention if it's still on the road or if it's been stood and needs recommissioning to get it going again. I should think you'd be looking at about £3500 to £6000. If you're looking to sell, it might be worth getting in touch with a few auction houses to get a guide price: you could try Classic Car Auctions, Anglia Car Auctions, Brightwells or perhaps Historics. And remember, it may not sell on the first (or even second attempt) because, although these are few and far between, so are the people who would like to own one (compared to something like, say, a Ford Escort).