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Crowds gathered outside Buckingham Palace on Sunday morning to watch Royal Navy sailors perform the Changing of the Guard ceremony for the first time in its 357-year history.
86 sailors from 45 Royal Navy ships and establishments spent a month learning the intricate routines before being deemed ready to carry out the event for real.
The ceremony, which has been taking place since the restoration of King Charles II in 1660, is traditionally performed by one of the five Foot Guards Regiments from the Army's Household Division.
The sailors trained at the Royal Navy's headquarters in Portsmouth, with their new skills being polished by drill instructors from the 1st Battalion Coldstream Guards.
They marched through the famous gates to the theme tune of Game Of Thrones watched by thousands of tourists.
The roots of the Changing of the Guard ceremony can be traced all the way back to the reign of Henry VII when the first royal bodyguard was created.