Have you checked that the car has Type Approval for UK importation?

Check out DVLA's website first and read the pdf entitled:

INF106

You can download it here:

http://www.dft.gov.uk/dvla/search.aspx?keywords=import

and there's more info here

http://www.direct.gov.uk/en/Motoring/BuyingAndSellingAVehicle/ImportingA...