The Queen's Guard was left red-faced as he slipped on a manhole cover during the famous Changing of the Guard. <br /><br />He lost his footing and slid sideways, knocked his bearskin on the side of the box and dropped his rifle. <br /><br />The soldier quickly scrambled to his feet as his colleagues marched past as if nothing had happened.<br /><br />The video was filmed in 2015.
