Harold Wilson conspiracy theories
Since the mid-1970s, a variety of conspiracy theories have emerged regarding British Labour Prime Minister Harold Wilson, who served as the Prime Minister of the United Kingdom from 1964 to 1970 and 1974 to 1976, winning four general elections. These range from Wilson having been a Soviet agent (a claim which MI5 investigated and found to be false), to Wilson being the victim of treasonous plots by conservative-leaning elements in MI5, claims which Wilson himself made.
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.