SDP-Liberal Alliance

The SDP-Liberal Alliance was an electoral alliance of the Social Democratic Party (SDP) and the Liberal Party in the United Kingdom that operated from 1981 to 1988, when the bulk of the two parties merged to form the Social and Liberal Democrats, later referred to as simply the Liberal Democrats.Following the establishment of the SDP by dissidents from the Labour Party in March 1981, the new party entered into an informal alliance with the existing centre party, the Liberals, led by David Steel. The SDP fought its first by-election, in Warrington, with future leader Roy Jenkins standing as "SDP with Liberal support".
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