The Duke & Duchess Of Cambridge And Prince Harry Outline Plans For Heads Together Ahead Of The 2017 Virgin Money London Marathon

LONDON, UNITED KINGDOM - JANUARY 17: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge attends a briefing to outline the next phase of Heads Together ahead of the 2017 Virgin Money London Marathon at the ICA on January 17, 2017 in London, England. Heads Together, Charity of the Year for the 2017 Virgin Money London Marathon, is led by The Duke & Duchess of Cambridge and Prince Harry in partnership with leading mental health charities. (Photo by Max Mumby/Indigo/Getty Images)