Which brings me on to an interesting point about plates here. On most cars (there are some exceptions), a numberplate can be retained by the owner of a vehicle before passing it on. By paying a fee, which I think is about ?80 a year, you can keep that numberplate and then use it as a private one on a different vehicle. The vehicle you 'took' the number from then gets reassigned with an age related plate.
A real issue for vintage and classic cars, is referred to as plate rape, whereby a low value historic vehicle is bought solely for the numberplate, and the vehicle is then passed on to someone else. This leaves many old cars without their original number plates, which in my eyes, and many others, are an important part of a vehicle's history, and a real shame that people profiteer from it.
There's a few calling for vehicles over a certain age to have their numbers protected so they can't be stolen like this, but the DVLA would never support such a thing since they profit so well from it.