LONDON, ENGLAND - JULY 12:   Britain's Queen Elizabeth II, her husband Prince Philip, Duke of Edinburgh, King Felipe VI of Spain and Queen Letizia of Spain pose for a group photograph before a State Banquet at Buckingham Palace 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)
Spanish King Felipe VI (2L) and Queen Letizia (2R) are greeted by Britain's Prince Charles, Prince of Wales (L) and Camilla, Duchess of Cornwall (R) at their hotel before a ceremonial welcome at Horse Guards Parade by Britain's Queen Elizabeth II (L) and Prince Philip, Duke of Edinburgh at the start of the Spanish King and Queen's three-day state visit, in central London on July 12, 2017.
Spanish King Felipe VI and Queen Letizia begin a state visit to Britain on Wednesday, as the two countries attempt to strengthen ties despite tensions over Britain's plans to leave the European Union. / AFP PHOTO / POOL / HANNAH MCKAY        (Photo credit should read HANNAH MCKAY/AFP/Getty Images)
LONDON, ENGLAND - JULY 12:  Britain's Queen Elizabeth II, Prince Philip, Duke of Edinburgh and King Felipe VI of Spain and Queen Letizia of Spain look at a display of Spanish items from the Royal Collection at Buckingham Palace 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 Neil Hall - WPA Pool/Getty Images)
LONDON, ENGLAND - JULY 12:    King Felipe VI of Spain and Queen Letizia of Spain visit the Palace of Westminster 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 Hannah McKay - WPA Pool/Getty Images)
LONDON, ENGLAND - JULY 12:   Britain's Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall greet King Felipe VI of Spain and Queen Letizia of Spain as they visit Clarence House in central London 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 Chris J Ratcliffe - WPA Pool/Getty Images)