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LONDON, ENGLAND - FEBRUARY 14: Prince Harry and Prince Charles, Prince of Wales attend the 'International Year of The Reef' 2018 meeting at Fishmongers Hall on February 14, 2018 in London, England. (Photo by Matt Dunham - WPA Pool/Getty Images)

LONDON, ENGLAND - FEBRUARY 14:  Prince Harry and Prince Charles, Prince of Wales attend the 'International Year of The Reef' 2018 meeting at Fishmongers Hall on February 14, 2018 in London, England.  (Photo by Matt Dunham - WPA Pool/Getty Images)

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LONDON, ENGLAND - FEBRUARY 14: Prince Harry and Prince Charles, Prince of Wales attend the 'International Year of The Reef' 2018 meeting at Fishmongers Hall on February 14, 2018 in London, England. (Photo by Matt Dunham - WPA Pool/Getty Images)

LONDON, ENGLAND - FEBRUARY 14:  Prince Harry and Prince Charles, Prince of Wales attend the 'International Year of The Reef' 2018 meeting at Fishmongers Hall on February 14, 2018 in London, England.  (Photo by Matt Dunham - WPA Pool/Getty Images)

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LONDON, ENGLAND - FEBRUARY 14: Prince Harry and Prince Charles, Prince of Wales attend the 'International Year of The Reef' 2018 meeting at Fishmongers Hall on February 14, 2018 in London, England. (Photo by Matt Dunham - WPA Pool/Getty Images)

LONDON, ENGLAND - FEBRUARY 14:  Prince Harry and Prince Charles, Prince of Wales attend the 'International Year of The Reef' 2018 meeting at Fishmongers Hall on February 14, 2018 in London, England.  (Photo by Matt Dunham - WPA Pool/Getty Images)

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LONDON, ENGLAND - FEBRUARY 14: Prince Harry and Prince Charles, Prince of Wales attend the 'International Year of The Reef' 2018 meeting at Fishmongers Hall on February 14, 2018 in London, England. (Photo by Matt Dunham - WPA Pool/Getty Images)

LONDON, ENGLAND - FEBRUARY 14:  Prince Harry and Prince Charles, Prince of Wales attend the 'International Year of The Reef' 2018 meeting at Fishmongers Hall on February 14, 2018 in London, England.  (Photo by Matt Dunham - WPA Pool/Getty Images)

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LONDON, ENGLAND - FEBRUARY 14: Prince Harry and Prince Charles, Prince of Wales arrive to attend the 'International Year of The Reef' 2018 meeting at Fishmongers Hall on February 14, 2018 in London, England. (Photo by Matt Dunham - WPA Pool/Getty Images)

LONDON, ENGLAND - FEBRUARY 14:  Prince Harry and Prince Charles, Prince of Wales arrive to attend the 'International Year of The Reef' 2018 meeting at Fishmongers Hall on February 14, 2018 in London, England.  (Photo by Matt Dunham - WPA Pool/Getty Images)