Harold Wilson imprisoned for fraud, and Sir Eric Miller, who later committed suicide while under police investigation for corruption. The Labour Party held an election to replace Wilson as leader of the Party (and therefore Prime Minister). Six candidates stood in the first ballot; in order of votes they were: Michael Foot, James Callaghan, Roy Jenkins, Tony Benn, Denis Healey and Anthony Crosland. In the third ballot on 5 April, Callaghan defeated Foot in a parliamentary vote of 176 to 137, thus becoming Wilson's successor as Prime Minister and leader of the Labour Party, and he continued to serve as Prime Minister
Prime minister to then, it was the "entire" government that made the request. Similarly, though the modern 1937 Irish constitution grants to the Taoiseach the right to make the request, the earlier 1922 Irish Free State Constitution vested the power in the "Executive Council" (the then name for the Irish cabinet). In Australia, the Prime Minister is expected to step down if s/he loses the majority support of his/her party under a spill motion as have many such as Tony Abbott, Julia Gillard, Kevin Rudd and Malcolm Turnbull. In the Russian constitution the prime minister is actually titled "Chairman of the government"