Changes to Council Directive 75/362/EEC of 16 June 1975 concerning the mutual recognition of diplomas, certificates and other evidence of formal qualifications in medicine, including measures to facilitate the effective exercise of the right of establishment and freedom to provide services
EU Directive 1975/362
Made by Council Directive 81/1057/EEC of 14 December 1981 supplementing Directives 75/362/EEC, 77/452/EEC, 78/686/EEC and 78/1026/EEC concerning the mutual recognition of diplomas, certificates and other evidence of the formal qualifications of doctors, nurses responsible for general care, dental practitioners and veterinary surgeons respectively, with regard to acquired rights
From legislation.gov.uk's record of changes, the official one: see it there.