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Britain's Queen Elizabeth II (2R) and Britain's Prince Philip, Duke of Edinburgh (L) accompany Chinese President Xi Jinping (R) and his wife Peng Liyuan as they arrive for a state banquet at Buckingham Palace in London, on October 20, 2015. Chinese President Xi Jinping arrived for a four-day state visit as the government of Prime Minister David Cameron seeks stronger trade ties with the world's second-largest economy. AFP PHOTO / POOL / TOBY MELVILLE / AFP / POOL / TOBY MELVILLE (Photo credit should read TOBY MELVILLE/AFP/Getty Images)

Britain's Queen Elizabeth II (2R) and Britain's Prince Philip, Duke of Edinburgh (L) accompany Chinese President Xi Jinping (R) and his wife Peng Liyuan as they arrive for a state banquet at Buckingham Palace in London, on October 20, 2015.  Chinese President Xi Jinping arrived for a four-day state visit as the government of Prime Minister David Cameron seeks stronger trade ties with the world's second-largest economy.    AFP PHOTO / POOL / TOBY MELVILLE / AFP / POOL / TOBY MELVILLE        (Photo credit should read TOBY MELVILLE/AFP/Getty Images)