7.—(1) No operator of a tank container or tank wagon shall cause or permit to be carried therein any dangerous goods unless the letter Y appears in column 7 of the Approved Carriage List in relation to those goods.
(2) No operator of a tank container or tank wagon shall cause or permit to be carried therein any dangerous goods if the pressure of that tank exceeds the maximum working pressure stated in the certificate referred to in regulation 9(2).
(3) No operator of a tank container or tank wagon shall cause or permit to be carried therein any dangerous goods unless the information relating to certification of tanks specifed in the Approved Tank Requirements is indelibly marked on one or more corrosion-resistant plates which are securely fastened to the tank of the tank container or tank wagon concerned, or to a support which is welded to the tank, in a position readily accessible for inspection.