The Queen's Guard in London comprises two detachments: the Buckingham Palace Detachment and the St James's Palace Detachment. The Queen's Guard changes at 11:30am in the forecourt at Buckingham Palace. At Windsor Castle the ceremony usually takes place in the Castle's quadrangle at 11:30am. In summer the ceremony takes place every day. In winter it takes place every other day.
The soldiers currently on duty form up in front of the Palace and are relieved by the New Guard which arrives from Wellington Barracks. The ceremony reflects traditions and represents a formal handover of responsibilities, accompanied by a Band or Corps of Drums.
The Queen's Life Guard are the mounted troopers of the Household Cavalry who guard the official entrance to St James's Palace and Buckingham Palace outside Horse Guards in Whitehall. The Guard Changing Ceremony takes place each weekday at 11:00am and at 10:00am on Sundays at Horse Guards. The mounted sentries (who change every hour) are on duty each day from 10:00am until 4:00pm.