Do you have an Orange phone? If so then you can do a basic vehicle check for free on their "Orange World" WAP service.

Here's what it says for mine:
J758LRV
Make: CHEVROLET GMC
Colour: BLACK AND WHITE
Vehicle engine size: 5736
First registered: 16/09/2002

PM me the reg if you don't have access.

edit: I would be *seriously* surprised if they give you their name/address if you say that you want to buy their registration!

Gareth