The accession of the United Kingdom to the European Communities (EC) – the collective term for the European Coal and Steel Community (ECSC), the European Economic Community (EEC) and the European Atomic Energy Community (EAEC) – took effect on 1 January 1973. This followed ratification of the Accession treaty which was signed in Brussels on 22 January 1972 by the Conservative prime minister Edward Heath, who had pursued the UK's application to the EEC since the late 1950s. The ECSC and EEC would later be integrated into the European Union under the Maastricht and Lisbon treaties in the early 1990s and mid-2000s.

The Curse of Peladon is the second serial of the ninth season of the British science fiction television series Doctor Who, which was first broadcast in four weekly parts on BBC1 from 29 January to 19 February 1972.