Not relevant to Nick's question exactly, but you can't drive in the UK on even a valid license from another country if your UK one is revoked. Some folk legally hold a number of valid licenses for a variety of reasons! You can't say "taken my license have you? ; never mind I'll use this one instead...".
Bit of loophole, since you could show apparent proof that you are allowed to drive in the UK when in fact you would not be.