Is there

[InkedMuttley]

If you look on the DVLA site there is I believe a service where they will give you the details of the car and where the owner lives for a nominal fee (think it's something like £5) but it must be for a valid reason so say for instance you wanted to know where the Trabant that you owned in 2002 that you loved is and whether it is still in running order therefore you would like to contact the owner to find out said information.

Myself I'm pretty sure that's a breach of the Data Protection Act, but such a service does exist.