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LONDON, UNITED KINGDOM - JULY 12: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Queen Elizabeth II looks on as Prince Philip, Duke of Edinburgh shakes hands with King Felipe VI of Spain during the ceremonial welcome at Horse Guards Parade on day 1 of Spanish State Visit 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 Max Mumby/Indigo/Getty Images)

LONDON, UNITED KINGDOM - JULY 12: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Queen Elizabeth II looks on as Prince Philip, Duke of Edinburgh shakes hands with King Felipe VI of Spain during the ceremonial welcome at Horse Guards Parade on day 1 of Spanish State Visit 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 Max Mumby/Indigo/Getty Images)