FG86, she did not do a world cruise, the royal family to South Africa in 1947 was as far as she got. HM the Queen celebrated her 21st birthday (as Princess Elizabeth) on the tour where she made her famous "dedication" speech.
On the U.S. Naval Historical Center website this photograph is described as:
HMS Vanguard (British Battleship, 1946)
The ship's Royal Marine detachment stand at attention on the quarterdeck, during the flag raising ceremony, 12 September 1952. To the rear is the Royal Marine Band. Vanguard was about to put to sea with the fleet to begin the NATO exercise Operation "Mainbrace".
Photographed by Blanchette.
Good spot FG! - I hadn't noticed the very elaborate mushroom vent covers, they must have kept the chippies party busy for weeks!!
I suppose the embarked Flag staff did need somewhere to leave the glasses of Pink Gin after Sundowners!!