'An ex-Scotland Yard detective has made the extraordinary claim that police covered up a serial killer who stalked and murdered 18 people on the London Underground. He apparently killed his victims in the 1970s by pushing them onto the tracks and former policeman Geoff Platt has alleged that police deliberately kept the case from the public so as not to cause widespread panic. Mr Platt said that he listened to Kiernan Kelly confess his crimes to police first hand after he was picked up in 1984 for being drunk and disorderly. Having brutally murdered his cellmate, William Boyd, Kelly allegedly...