(LtoR) Gilly Yarrow, wife of the Lord Mayor of London Alan Yarrow, Mexican President Enrique Pena Nieto, the Lord Mayor of London, and the Mexican President's wife Angelica Rivera stand and wait before President Nieto inspects the Guard of Honour ahead of a banquet at the Guildhall in central London on March 4, 2015.  AFP PHOTO / JUSTIN TALLIS        (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)