The King's Troop Royal Horse Artillery in preparation for an inspection on the parade ground of her barracks in St John's Wood before departing to fire a 41 gun salute in Hyde Park to mark the 60 anniversary of the accession of Her Majesty Queen Elizabeth II on February 6, 2012 in London, England. The 41 gun salute also signifies the official start to the celebrations for the Queen's Diamond Jubilee and comes after the King's Troop left their barracks in St. John's Wood for the final time. The King's Troop Royal Horse Artillery will relocate from their North London barracks, where they have been based since their formation by King George VI in 1947, to a purpose-built equestrian site in Woolwich. (Photo by Oli Scarff/Getty Images)