Cheap number plates can be a good option when looking for replacement number plates. That said there are a few things to be careful of. It used to be that anyone could supply number plates, not any more. Only outlets registered with the Driver and Vehicle Licensing Agency, DVLA, can legally supply number plates in the United Kingdom.
Every number plates issued has to have the supplier name and post code at the bottom some suppliers of cheap number plates may not do this. There are strict rules about the size of the characters the font they appear in and their spacing. Any number plates that fall short of the criteria are illegal.
It is the job of the police to enforce the legislation surrounding number plates and they have powers to fine up to £1000 and can in extreme cases have the vehicle registration number withdrawn. It is an offense to mis represent a vehicle registration number in order to make a name or word. Always make sure your number plate supplier is on the DVLA register even when buying cheap number plates.