FILE - Britain's Queen Elizabeth II, centre right and Prime Minister Margaret Thatcher, centre left pose with former British premiers at a dinner at London's 10 Downing Street, Dec. 4, 1985, to celebrate the 250th anniversary of the British prime minister's London residence. From left, James Callaghan, Alec Douglas-Home, Harold Macmillan, Harold Wilson and Edward Heath. In seven decades on the throne, Queen Elizabeth II saw 15 British prime ministers come and go, from Winston Churchill to Margaret Thatcher to Boris Johnson to Liz Truss. (Pool Photo via AP, File)