History of the Labour Party (UK) 1983 election, Labour suffered a landslide defeat, winning only 27.6% of the vote and securing just 209 seats. This was their worst performance at a general election since 1918. Labour won only half a million votes more than the SDP-Liberal Alliance, which had attracted the votes of many moderate Labour supporters, although the Alliance only won 23 seats. Michael Foot criticised the Alliance for "siphoning" Labour support and allowing the Tories to win more seats. Michael Foot resigned and was replaced as leader by Neil Kinnock who was elected on 2 October 1983 and progressively moved the party towards the
History of the Labour Party (UK) which the yes and no campaigns were both cross-party – the referendum voted in 1975 to continue Britain's membership by two thirds to one third. This issue later caused catastrophic splits in the Labour Party in the 1980s, leading to the formation of the Social Democratic Party. In the initial legislation during the Heath Government, the Bill affirming Britain's entry was only passed because of a rebellion of 72 Labour MPs led by Roy Jenkins and including future leader John Smith, who voted against the Labour whip and along with Liberal MPs more than countered the effects of Conservative rebels