Facts

Wellington Barracks is a military barracks in Westminster, central London, for the Foot Guards battalions on public duties in that area. The building is located about three hundred yards from Buckingham Palace, allowing the guard to be able to reach the palace very quickly in an emergency, and lies between Birdcage Walk and Petty France. Three companies are based at the barracks, as well as all of the Foot Guards bands and the regimental headquarters.

Source: Wikipedia