When Rob Rinder successfully defended a man accused of murder, he sighed with relief as they both walked triumphantly from court. It’s also a moment that’s haunted him for 20 years. Not because he believes he got it wrong, or the legal system failed, but because the victim’s family are still without justice. Understandably anxious, as he prepared to face them for the first time in two decades, in a new documentary, Rob Rinder : The Crime I Can’t Forget, he meets relatives of Lucy Hargreaves, a