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Britain's Queen Elizabeth II (R) meets President of Guyana David Granger (L) during a private audience at Windsor Castle, west of London on April 26, 2017. / AFP PHOTO / POOL / Steve Parsons (Photo credit should read STEVE PARSONS/AFP/Getty Images)

Britain's Queen Elizabeth II (R) meets President of Guyana David Granger (L) during a private audience at Windsor Castle, west of London on April 26, 2017.  / AFP PHOTO / POOL / Steve Parsons        (Photo credit should read STEVE PARSONS/AFP/Getty Images)

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WINDSOR, ENGLAND - APRIL 26: Queen Elizabeth II meets His Excellency David Granger, President of the Co-operative Republic of Guyana during a a private audience at Windsor Castle. (Photo by Steve Parsons - WPA Pool /Getty Images)

WINDSOR, ENGLAND - APRIL 26:  Queen Elizabeth II meets His Excellency David Granger, President of the Co-operative Republic of Guyana during a a private audience at Windsor Castle.   (Photo by Steve Parsons - WPA Pool /Getty Images)

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WINDSOR, ENGLAND - APRIL 26: Queen Elizabeth II meets His Excellency David Granger, President of the Co-operative Republic of Guyana during a a private audience at Windsor Castle. (Photo by Steve Parsons - WPA Pool /Getty Images)

WINDSOR, ENGLAND - APRIL 26:  Queen Elizabeth II meets His Excellency David Granger, President of the Co-operative Republic of Guyana during a a private audience at Windsor Castle.   (Photo by Steve Parsons - WPA Pool /Getty Images)