LONDON, ENGLAND - OCTOBER 19:  Chinese President Xi Jinping and his wife Peng Liyuan arrive for a four-day state visit at Heathrow Airport on October 19, 2015 in London, England. In addition to meeting with Prime Minister David Cameron, the Chinese President and his wife will be hosted by Queen Elizabeth II and The Duke of Edinburgh at Buckingham Palace from October 20 - 22.  (Photo by Toby Melville - WPA Pool/Getty Images)