The Duke, Duchess and Prince Harry congratulate those who took part in the 37th #LondonMarathon - many wearing #TeamHeadsTogether headbands. @heads_together is the official charity of the Marathon. Their Royal Highnesses have spearheaded the #headstogether campaign, as part of The Royal Foundation, to try to reduce the stigma around mental health. The #OkToSay campaign encourages people to have conversations to help change people's lives. A post shared by Kensington Palace (@kensingtonroyal) on Apr 23, 2017 at 7:20am PDT