You should use form V55/4 to register a new vehicle, for example, imported vehicles and kit cars that have never been registered before.
Ref: V355/4 PDF, 1.03MB, 6 pages
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Use the V55/4 form to register a new vehicle.
Many types of vehicle can be registered using form V55/4, this guide deals with the common types of vehicle.
You can order a V55/4: application for first vehicle tax and registration of a new motor vehicle from DVLA.