The controversy around the collapse of the royal marriage between Princess Diana and Prince Charles was extraordinary and was the centre of the media for some time, but it was heightened to another level with Andrew Morton’s tell-all book, Diana: Her True Story.The book - published in 1992 - covered Charles and Diana's loveless marriage, Charles’s alleged infidelity, and the princess’s struggles with bulimia, self-harm and suicidal thoughts. And heartbreakingly, when the marriage finally ended in 1996, Prince William told his mother he wanted to become a policeman to protect her in case she was stripped of her royal title. “He once told her he wanted to be a policeman so that he could protect her,” says royal expert Robert Jobson.