I was looking into a M3 Evo GT11 in Southern ireland. I had a mate who imported a truck from there, you have something like 60 days or 3 months to register the car in the UK. It will need a MOT and a full check over if it was not registered in the UK originally. DVLA will have to find a registration for it etc. Does not cost much unless it is a dog and fails the MOT but is a bit of a pain in the ass with paperwork etc.