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Regulation 10(3)
1. If the vehicle carries a GB or NI registration mark, the custodian shall ascertain from the GB or, as the case may be, the NI records the name and address of the person by whom the vehicle is kept.
2. If the vehicle does not carry such a registration mark, the custodian shall make such inquiries as appear to him to be practicable to ascertain the identity of the owner of the vehicle.