What an awful situation you find yourself in. The DVLA website says to register a new vehicle you need:
Perhaps you will need to exercise your consumer rights and notify them that you are returning the vehicle and require a full refund. If nothing else it might get the dealer to sort the problem out and learn to do his job properly.
- a certificate of newness (or declaration of newness for imported vehicles), if the vehicle is new
Vehicle registration
How to register your vehicle and the cost - new registrations, kit cars, rebuilds, radically altered vehicles, old and classic vehicles, vehicle identification numbers, Q plates
www.gov.uk