Since then, the Union Flag flies from the Palace when the Queen is not in residence, and has flown at half mast upon the deaths of members of the Royal Family, and other times of national mourning such as following the terrorist bombings in London on 7 July 2005, the death of former U.S. president Gerald Ford and the death of Margaret Thatcher on 8 April 2013.
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Most famously it signals the presence of the monarch at a royal residence, and is also used on official vehicles, primarily the Bentley State Limousine, but also on other road vehicles at home or abroad, often a Range Rover.