4. In regulation 24 (Portable tanks and receptacles) for paragraph (a) there shall be substituted—
“(a)a portable tank, the operator of the tank shall ensure that it is correctly filled and either—
(i)in the case of a portable tank to which the Carriage of Dangerous Goods by Road Regulations (Northern Ireland) 1997 (S.R. 1997 No. 248) applies, and
(aa)the tank was constructed before 1st January 1999, complies with the requirements of paragraph 1 of Schedule 3 to those Regulations; or
(bb)the tank was constructed after 31st December 1998, complies with the Approved Tank Requirements, as defined in regulation 2(1) of those Regulations, insofar as they relate to the carriage of dangerous goods in portable tanks, is suitable to be used for the carriage of dangerous goods and has been adequately maintained; or
(ii)in any other case, the portable tank is suitable for the purpose and complies with the requirements of regulation 6 of the Carriage of Dangerous Goods (Classification, Packaging and Labelling) and Use of Transportable Pressure Receptacles Regulations (Northern Ireland) 1997.”.