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The Chief Mouser to the Cabinet Office is the unofficial title of the official resident cat of the Prime Minister of the United Kingdom at 10 Downing Street. Only two cats, Humphrey and Larry (pictured), have been given the title officially; the other cats are given this title affectionately, usually by the British press. There has been a resident Treasury or Downing Street cat employed as a mouser and pet since the reign of Henry VIII when Cardinal Wolsey placed his cat by his side while acting in his judicial capacity as Lord Chancellor. The cat with the longest tenure at Downing Street is Wilberforce, who served under Edward Heath, Harold Wilson, Jim Callaghan and Margaret Thatcher. The departure of the last incumbent, Sybil, was in January 2009. Sybil was owned by the then Chancellor of the Exchequer Alistair Darling, who lived in 10 Downing Street while the then Prime Minister, Gordon Brown, lived in the larger 11 Downing Street. (Full list...)