What we do here in my country, is get the car to a police station that deals with stolen or impounded cars. They do a reserialization of stolen cars and are able to make a new number stamp on the chassis, so with all papers of ownership, they can make you a new clone stamp with a police one next to it so it is 100% legal.
Ask around by the police or MOT station, they should know about it, if not try a restaurateur specialist, they should know stuff like that.
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