Gaitskellism
Wilson went on to become Prime Minister in the 1964 election, holding the position from 1964 to 1970 and from 1974 to 1976. Despite being a former Bevanite, Wilson largely followed Gaitskellite economic policies, and the former Gaitskellite Callaghan followed Wilson as Prime Minister from 1976 to 1979 and Party Leader from 1976 to 1980.
James Callaghan
Barely two years after beginning his second spell as Prime Minister, Wilson announced his surprise resignation on 16 March 1976, and unofficially endorsed Callaghan as his successor. Callaghan was the favourite to win the leadership election; although he was the oldest candidate, he was also the most experienced and least divisive. Popularity with all parts of the Labour movement saw him through the ballot of Labour MPs to win the leadership vote. On 5 April 1976, at the age of 64 years and 9 days, Callaghan became Prime Minister—the oldest person to become Prime Minister at time of appointment since Winston Churchill.