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The George VI Memorial Chapel in St George's Chapel, Windsor, where Queen Elizabeth, the Queen Mother was intered, after her funeral in Westminster Abbey. She was laid to rest alongside her husband, King George VI, who died in 1952. * The casket that contains the ashes of Princess Margaret, who died in February, is also being placed in the vault. (Photo by Tim Ockenden - PA Images/PA Images via Getty Images)

The George VI Memorial Chapel in St George's Chapel, Windsor, where Queen Elizabeth, the Queen Mother was intered, after her funeral in Westminster Abbey.  She was laid to rest alongside her husband, King George VI, who died in 1952.    * The casket that contains the ashes of Princess Margaret, who died in February, is also being placed in the vault.   (Photo by Tim Ockenden - PA Images/PA Images via Getty Images)

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The George VI Memorial Chapel in St George's Chapel, Windsor, where Queen Elizabeth, the Queen Mother was intered, after her funeral in Westminster Abbey. She was laid to rest alongside her husband, King George VI, who died in 1952. * The casket that contains the ashes of Princess Margaret, who died in February, is also being placed in the vault. (Photo by Tim Ockenden - PA Images/PA Images via Getty Images)

The George VI Memorial Chapel in St George's Chapel, Windsor, where Queen Elizabeth, the Queen Mother was intered, after her funeral in Westminster Abbey.  She was laid to rest alongside her husband, King George VI, who died in 1952.    * The casket that contains the ashes of Princess Margaret, who died in February, is also being placed in the vault.   (Photo by Tim Ockenden - PA Images/PA Images via Getty Images)

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The entrance to the vault in St George's Chapel, Windsor, where Queen Elizabeth, the Queen Mother was intered, after her funeral in Westminster Abbey. She was laid to rest alongside her husband, King George VI, who died in 1952. * The casket that contains the ashes of Princess Margaret, who died in February, is also being placed in the vault. (Photo by Tim Ockenden - PA Images/PA Images via Getty Images)

The entrance to the vault in St George's Chapel, Windsor, where Queen Elizabeth, the Queen Mother was intered, after her funeral in Westminster Abbey.  She was laid to rest alongside her husband, King George VI, who died in 1952.    * The casket that contains the ashes of Princess Margaret, who died in February, is also being placed in the vault.   (Photo by Tim Ockenden - PA Images/PA Images via Getty Images)

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The George VI Memorial Chapel in St George's Chapel, Windsor, where Queen Elizabeth, the Queen Mother was intered after her funeral in Westminster Abbey. She was laid to rest alongside her husband, King George VI, who died in 1952. * The casket that contains the ashes of Princess Margaret, who died in February 2002, is also being placed in the vault. (Photo by Tim Ockenden - PA Images/PA Images via Getty Images)

The George VI Memorial Chapel in St George's Chapel, Windsor, where Queen Elizabeth, the Queen Mother was intered after her funeral in Westminster Abbey.  She was laid to rest alongside her husband, King George VI, who died in 1952.   *  The casket that contains the ashes of Princess Margaret, who died in February 2002, is also being placed in the vault.   (Photo by Tim Ockenden - PA Images/PA Images via Getty Images)

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The George VI Memorial Chapel in St George's Chapel, Windsor, where Queen Elizabeth, the Queen Mother was intered, after her funeral in Westminster Abbey. She was laid to rest alongside her husband, King George VI, who died in 1952. * The casket that contains the ashes of Princess Margaret, who died in February, is also being placed in the vault. See PA story ROYAL Mother. PA Photo: Tim Ockenden. SOLO POOL. (Photo by Tim Ockenden - PA Images/PA Images via Getty Images)

The George VI Memorial Chapel in St George's Chapel, Windsor, where Queen Elizabeth, the Queen Mother was intered, after her funeral in Westminster Abbey.  She was laid to rest alongside her husband, King George VI, who died in 1952.    * The casket that contains the ashes of Princess Margaret, who died in February, is also being placed in the vault.  See PA story ROYAL Mother.  PA Photo: Tim Ockenden. SOLO POOL.   (Photo by Tim Ockenden - PA Images/PA Images via Getty Images)