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Britain's Prince William, Duke of Cambridge (R), and his wife Britain's Catherine, Duchess of Cambridge (2R), greet Chinese President Xi Jinping (2L) and his wife Peng Liyuan as they arrive at Lancaster House in London, on October 21, 2015, to attend a UK-China Creative Collaborations Summit. Britain and China are set to seal business contracts worth billions, the second day of President Xi Jinping's state visit, including on Britain's first nuclear power plant in decades. AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/Getty Images)

Britain's Prince William, Duke of Cambridge (R), and his wife Britain's Catherine, Duchess of Cambridge (2R), greet Chinese President Xi Jinping (2L) and his wife Peng Liyuan as they arrive at Lancaster House in London, on October 21, 2015, to attend a UK-China Creative Collaborations Summit. Britain and China are set to seal business contracts worth billions, the second day of President Xi Jinping's state visit, including on Britain's first nuclear power plant in decades.     AFP PHOTO / LEON NEAL        (Photo credit should read LEON NEAL/AFP/Getty Images)