The result strengthened Harold Wilson's tactical position, by securing a further post-election public expression of support for his policies. According to Cook and Francis (1979), ‘The left of his party had been appeased by the holding of a referendum, the right by its result’. Following the result, the Labour Party and British trade unions themselves joined European institutions, such as the Socialist Group in the European Parliament, to which they had been reluctant to commit before public approval of EC membership.
