(LtoR) An unidentified person, Britain's Birgitte, Duchess of Gloucester, Gilly Yarrow, wife of the Lord Mayor of London, Mexican President Enrique Pena Nieto, the Lord Mayor of London Alan Yarrow, the Mexican President's wife Angelica Rivera, and Britain's Prince Richard, Duke of Gloucester, pose for photographers as they attend a banquet held in honour of the Mexican President and his wife at the Guildhall in central London on March 4, 2015.  AFP PHOTO / JUSTIN TALLIS        (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)