Labour government, 1974–1979
In March 1976, having just turned sixty years old, Wilson resigned as Prime Minister, ending his leadership of the Labour Party after thirteen years, and a total of nearly eight years as Prime Minister. He was replaced by James Callaghan, who had held senior government positions during both of Wilson's ministries, and had served as a Shadow Cabinet member in the early-1960s.
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).