Calling all Blue Lights fans! The wait is nearly over... 👀 Series 4 arrives on BBC iPlayer from 29 Sep. Here’s what to expect. #BlueLights #DramaSeries #Belfast #NorthernIreland Blue Lights: For police officers in Belfast, the pressure is immense. Facing criminal gangs and divided communities, they don’t know who to trust. Gritty, BAFTA-winning drama.