<P> The Royal Standard of the United Kingdom is flown when the Queen is in residence in one of the royal palaces and on her car , ship or aeroplane . It may be flown on any building , official or private , during a visit by the Queen , if the owner or proprietor so requests . It famously replaces the Union Flag over the Palace of Westminster when the Queen visits during the State Opening of Parliament . The Royal Standard was flown aboard the royal yacht when it was in service and the Queen was on board . The only church that may fly a Royal Standard , even without the presence of the Sovereign , is Westminster Abbey , a Royal Peculiar . </P>
how do you know the queen is home
The Royal Standard of the United Kingdom is flown