24. The driver of a road tanker which has completed a delivery of petrol in accordance with the Part III procedure shall—
(a)ensure that one of the two duly completed copies of the certificate given to him in accordance with paragraph 2 l(b) and completed by him in accordance with paragraph 23(b)(i) before the delivery commenced is given back to the licensee (who shall keep it at the licensed premises for a period of at least 12 months); and
(b)give the second of the said copies to the supplier of the petrol.