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Queen Elizabeth II walks along the platform at King's Lynn railway station in Norfolk, as she returns to London after spending the Christmas period at Sandringham House in North Norfolk. (Photo by Victoria Jones/PA Images via Getty Images)

Queen Elizabeth II walks along the platform at King's Lynn railway station in Norfolk, as she returns to London after spending the Christmas period at Sandringham House in North Norfolk. (Photo by Victoria Jones/PA Images via Getty Images)

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KING'S LYNN, UNITED KINGDOM - FEBRUARY 07: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Queen Elizabeth II boards a train at King's Lynn Station to return to London after her Christmas break at Sandringham House. on February 7, 2017 in King's Lynn, England. The Queen celebrated her Sapphire Jubilee yesterday marking 65 years as Monarch. (Photo by Max Mumby/Indigo/Getty Images)

KING'S LYNN, UNITED KINGDOM - FEBRUARY 07: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Queen Elizabeth II boards a train at King's Lynn Station to return to London after her Christmas break at Sandringham House. on February 7, 2017 in King's Lynn, England. The Queen celebrated her Sapphire Jubilee yesterday marking 65 years as Monarch. (Photo by Max Mumby/Indigo/Getty Images)

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KING'S LYNN, UNITED KINGDOM - FEBRUARY 07: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Queen Elizabeth II boards a train at King's Lynn Station to return to London after her Christmas break at Sandringham House. on February 7, 2017 in King's Lynn, England. The Queen celebrated her Sapphire Jubilee yesterday marking 65 years as Monarch. (Photo by Max Mumby/Indigo/Getty Images)

KING'S LYNN, UNITED KINGDOM - FEBRUARY 07: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Queen Elizabeth II boards a train at King's Lynn Station to return to London after her Christmas break at Sandringham House. on February 7, 2017 in King's Lynn, England. The Queen celebrated her Sapphire Jubilee yesterday marking 65 years as Monarch. (Photo by Max Mumby/Indigo/Getty Images)

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Queen Elizabeth II walks along the platform at King's Lynn railway station in Norfolk, as she returns to London after spending the Christmas period at Sandringham House in North Norfolk. (Photo by Victoria Jones/PA Images via Getty Images)

Queen Elizabeth II walks along the platform at King's Lynn railway station in Norfolk, as she returns to London after spending the Christmas period at Sandringham House in North Norfolk. (Photo by Victoria Jones/PA Images via Getty Images)

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Queen Elizabeth II walks along the platform at King's Lynn railway station in Norfolk, as she returns to London after spending the Christmas period at Sandringham House in North Norfolk. (Photo by Victoria Jones/PA Images via Getty Images)

Queen Elizabeth II walks along the platform at King's Lynn railway station in Norfolk, as she returns to London after spending the Christmas period at Sandringham House in North Norfolk. (Photo by Victoria Jones/PA Images via Getty Images)