Ashes to Ashes: Episode 8

With the day of her parents' car bombing approaching, Alex makes their deaths into a case - a crime that has yet to happen. With Ray's help, Alex crushes a blue four-door Ford Escort that she thinks her parents died in, as a way to prevent her parents' murders, and then, after planting a small amount of cocaine, arrests her parents for drug possession. Lord Scarman is due to visit CID for an inspection, so Gene releases all the station's prisoners and locks Chris up, so that the station can get a good review. However, Gene releases Alex's parents who in turn arrange for the release of a prisoner who is the last person Alex would want set free.