BRENTFORD, ENGLAND - SEPTEMBER 17: The Duke of Cambridge with Joss Stone and CEO of Tusk Trust Charlie Mayhew during the Tusk Trust conservation charity 25th Anniversary Ball which honours the charity's impact in the midst of the continuing crisis facing wildlife in Africa on September 17, 2015 at Syon House, Brentford, London. (Photo by Chris Radburn/WPA Pool/Getty Images)