Don't show me this message again✕ (Rex Features) Q ueen Elizabeth II has long been said to adopt the mantra “never complain, never explain” in a bid to keep family matters behind closed doors; not become embroiled in media reports or speculation; and maintain the much-distinguished line between royalty and public. Largely this approach has worked, with the family circling the wagons at the hint of danger or scandal. But on 20 November 1995, Princess Diana broke ranks. The then-35-year-old decided that instead of protecting her in-laws and husband, from whom she had separated, she wanted to tell her side of the story. She agreed to a BBC One