Sorry to be petty, but the UK license plates are not valid for at least another 7 years. Here are how they work post Sep 01:
I know, and it's deliberate (if you count being lazy as deliberate). The vehicles are 1970 and 1997 models, so I used the plates "LY70 NDA" and "MR97 ROW". Also, using invalid plates means that they can't refer to an existing vehicle, although the 2002-2013 cars could still have problems with that...
EDIT: I just checked on WeBuyAnyCar.com, and three of my current plates match real vehicles, but are different to what they are in the game. Could this become a legal issue, or can I leave them as they are?
This is what I found:
Game Plate --> Real Plate
DAF LF --> Renault Clio
Mitsubishi L200 --> Mercedes-Benz C-Class
Neoplan Starliner --> Ford Ka