Changes to 75/487/EEC: Commission Decision of 23 July 1975 authorizing the United Kingdom to take certain protective measures in accordance with Article 108 (3) of the EEC Treaty
EU Decision 1975/487
Made by Commission Decision of 28 June 1977 amending the Decision of 23 July 1975 authorizing the United Kingdom to take certain protective measures in accordance with Article 108 (3) of the EEC Treaty
From legislation.gov.uk's record of changes, the official one: see it there.