Prince Harry and former royal nanny Tiggy Pettifer (formerly Tiggy Legge-Bourke) leave the Service of Thanksgiving for the life of Diana, Princess of Wales, at the Guards' Chapel, London. PRESS ASSOCIATION Photo. Picture date:Friday August 31, 2007. Prince William and Prince Harry organised the Thanksgiving Service to commemorate the life of their mother on the tenth anniversary of her death. See PA DIANA stories. Photo credit should read:Lewis Whyld/PA Wire