9.—(1) All the documents referred to in regulations 6 and 7 shall—
(a)in the case of any road tanker, be kept by the operator thereof either at the premises from which the tanker operates or at his principal place of business within Northern Ireland; and
(b)in the case of any tank container, be kept by the operator thereof at the address within Northern Ireland from which the deployment of the tank container is controlled.
(2) It shall be sufficient compliance with paragraph (1)(d) in circumstances where (by virtue of the fact that he does not have a place of business in Northern Ireland) the operator of the tank container is not its owner, if—
(a)photocopies of the documents concerned are kept at the operator’s place of business; or
(b)the documents concerned are readily available from the owner of the tank container.
(3) Where the operator of a road tanker or tank container changes, the previous operator shall, insofar as he is required to keep any document at an address in Northern Ireland in accordance with paragraph (1), give any such document to the new operator.
(4) Where either of the procedures referred to in regulation 7(4) has been used, it shall be sufficient compliance with paragraph (1) in respect of the report referred to in regulation 7(1)(c) if that report is kept by the operator concerned in a computer at the appropriate place specified in the said paragraph (1); and without prejudice to the generality of paragraph (3), if the operator changes in circumstances where the report referred to in regulation 7(1)(c) is kept in a computer in accordance with this paragraph, the previous operator shall provide the new operator with the information contained in that report in written form.