BBC One and BBC iPlayer will air the fourth series of Blue Lights starting Tuesday 29 September. The linear premiere is scheduled for 21:00 on BBC One, while all episodes will be available on BBC iPlayer from 06:00 that same day. The series is produced by Two Cities Television and co-produced by Gallagher Films.

The narrative focuses on response officers Grace Ellis, Tommy Foster, and Annie Conlon three years into their roles. Plot points include a murder trial involving the character Gerry Cliff. The cast includes Siân Brooke, Martin McCann, Katherine Devlin, and Nathan Braniff. Richard Dormer returns as Gerry Cliff for a single episode. Additional cast members include Joanne Crawford, Andi Osho, Frank Blake, and Abigail McGibbon.

Lindsay Salt, Director of BBC Drama, commissioned the series. Executive production is handled by Stephen Wright, Louise Gallagher, Declan Lawn, and Adam Patterson, with Nick Lambon serving as executive producer for the BBC. Two Cities Television operates as part of the STV Studios family of production labels.

BBC Studios manages global sales for the fourth series and all previous installments. The production has been sold in over 160 territories. Previous series of Blue Lights are currently available on BBC iPlayer.