Part two of two. A three-day long police interview of Robert Brown finally ended with a confession and the pilot leading officers to the site where Joanna Simpson was buried, a remote spot in Windsor Great Park. The trial that followed saw Brown deny murder with a defence of adjustment disorder due to diminished responsibility and 13 years on, he has served half his prison sentence and is due to be released. Can a high-profile campaign from Joanna's family keep him behind bars?