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.
Barbara Castle
Castle lost her place as a Cabinet minister when her bitter political enemy James Callaghan succeeded Wilson as Prime Minister following a leadership election. Although he left Wilson's Cabinet virtually unchanged, he dismissed Castle almost immediately upon taking office. Callaghan removed her under the pretext he wanted to lower the average age of his Cabinet, which she regarded as a "phoney reason". In an interview years later, she remarked that perhaps the most restrained thing she had ever achieved in her life was not to reply with "Then why not start with yourself, Jim?" (Callaghan was four years older than Wilson, the man he was replacing).