Changes to Council Directive 78/54/EEC of 19 December 1977 extending the derogations granted in respect of protection against swine fever to Denmark, Ireland and the United Kingdom
EU Directive 1978/54
Made by Council Directive 79/111/EEC of 24 January 1979 amending Directive 64/432/EEC as regards brucellosis and prolonging, in respect of brucellosis, tuberculosis and swine fever, certain derogation measures granted to Denmark, Ireland and the United Kingdom
From legislation.gov.uk's record of changes, the official one: see it there.