Partisan Dealignment in Britain 1964–1974

Britain enjoys a textbook reputation as the historic home and model representative of a stable two-party system. From the factors most frequently cited by way of explanation – the electoral system, the absence of cross-cutting social cleavages – it is implied that this uncommon state of affairs is a natural and permanent part of British politics. This reputation is, in fact, somewhat exaggerated. At no time have MPs or parliamentary candidates in Britain been confined to two parties only (in contrast to the United States); and for most of the period since the introduction of the majority male franchise and the beginning of mass parties in 1884 the configuration of party forces in the Commons would be best described as multi-party (1884–1922), three-party (1922–31), or dominant one-party (1931–45). Britain's experience of a stable two-party politics has therefore been both recent and relatively short-lived; it is only since the Second World War that two parties – Conservative and Labour – have alternated in exclusive incumbency of government office on the basis of an evenly balanced duopoly of electoral support and parliamentary seats.