Diana, Princess of Wales - security code name 'Purple Five Two' - travelled all over the world during her incredible life. Wherever she went, in public or in private, she was shadowed by her Scotland Yard personal protection officer, Inspector Ken Wharfe, whose job it was to keep her safe, even to the extent of sacrificing his own life, if necessary. In public Diana was feted wherever she went, greeted by adoring crowds and fawned over by the media...