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KING'S LYNN, UNITED KINGDOM - DECEMBER 17: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Prince Philip, Duke of Edinburgh walks along the platform at King's Lynn railway station after arriving by train to begin his annual Christmas break at Sandringham House on December 17, 2015 in King's Lynn, England. (Photo by Max Mumby/Indigo/Getty Images)

KING'S LYNN, UNITED KINGDOM - DECEMBER 17: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Prince Philip, Duke of Edinburgh walks along the platform at King's Lynn railway station after arriving by train to begin his annual Christmas break at Sandringham House on December 17, 2015 in King's Lynn, England. (Photo by Max Mumby/Indigo/Getty Images)