LONDON, ENGLAND - MARCH 11:  Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge laugh as they visit the mentoring programme of the XLP project at London Wall on March 11, 2016 in London, England. XLP supports young people who are facing emotional, behavioural and relational challenges. XL-Mentoring programme since 2008.  (Photo by Frank Augstein - WPA Pool/Getty Images)