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LONDON, ENGLAND - JULY 12: King Felipe VI of Spain inspects a guard of honour with Prince Philip, Duke of Edinburgh during a Ceremonial Welcome on Horse Guards Parade on July 12, 2017 in London, England. This is the first state visit by the current King Felipe and Queen Letizia, the last being in 1986 with King Juan Carlos and Queen Sofia. (Photo by Matt Dunham - WPA Pool/Getty Images)

LONDON, ENGLAND - JULY 12:   King Felipe VI of Spain inspects a guard of honour with Prince Philip, Duke of Edinburgh during a Ceremonial Welcome on Horse Guards Parade on July 12, 2017 in London, England.  This is the first state visit by the current King Felipe and Queen Letizia, the last being in 1986 with King Juan Carlos and Queen Sofia.   (Photo by  Matt Dunham - WPA Pool/Getty Images)

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LONDON, ENGLAND - JULY 12: Prince Philip, Duke of Edinburgh and King Felipe VI of Spain attend a Ceremonial Welcome on Horse Guards Parade during a State visit by the King and Queen of Spain on July 12, 2017 in London, England. This is the first state visit by the current King Felipe and Queen Letizia, the last being in 1986 with King Juan Carlos and Queen Sofia. (Photo by Samir Hussein/WireImage)

LONDON, ENGLAND - JULY 12:  Prince Philip, Duke of Edinburgh and King Felipe VI of Spain attend a Ceremonial Welcome on Horse Guards Parade during a State visit by the King and Queen of Spain on July 12, 2017 in London, England.  This is the first state visit by the current King Felipe and Queen Letizia, the last being in 1986 with King Juan Carlos and Queen Sofia.  (Photo by Samir Hussein/WireImage)