shall conform to performance standards adopted by the Organisation and specified in Merchant Shipping Notice No. M 1474 as having been so adopted;

in the case of equipment provided on United Kingdom ships, shall in addition conform to appropriate performance specifications issued by the Department of Trade and Industry or by the Department of Transport and specified in Merchant Shipping Notice No. M 928, any document amending the same which is considered by the Secretary of State to be relevant from time to time and is specified in a Merchant Shipping Notice.