LONDON, ENGLAND - OCTOBER 22:  Queen Elizabeth II and Prince Philip, Duke of Edinburgh bid farewell to President of the Peoples Republic of China, Mr Xi Jinping and his wife, Madame Peng Liyuan at Buckingham Palace on October 22, 2015 in London, England. The President of the Peoples Republic of China, Mr Xi Jinping and his wife, Madame Peng Liyuan, end a State Visit to the United Kingdom as guests of The Queen.  They stayed at Buckingham Palace and undertook engagements in London and Manchester. The last state visit paid by a Chinese President to the UK was Hu Jintao in 2005.  (Photo by Chris Jackson/Getty Images)