Blue Lights Season 3 Release Date Confirmed — Cast Say It’s the Best Season Yet

The PSNI team are on the brink of a comeback, with an imminent return set to reboot operations and test public confidence.
Blue Lights has kept us waiting a bit longer this time, but we finally have a date. Season 3 lands as a full box set on BBC iPlayer on Monday 29 September, with episode 1 also airing on BBC One at 9pm that night. Mark your calendars and maybe keep a cushion nearby for the inevitable Belfast chaos.
Why the longer gap?
Seasons 1 and 2 arrived a year apart. This time it has been about a year and a half. The reason is actually a bit of inside baseball: the BBC handed the show a double renewal for seasons 3 and 4, which meant the team had to map out a bigger arc and make sure both seasons dovetail properly. More planning, more coordination, longer wait.
What season 3 is about
We pick up two years into the job for response officers Grace, Annie, and Tommy. The cases push them into a slicker, scarier corner of the city: the respectable-looking world where accountants and lawyers grease the wheels for organized crime. The old guard – politically and criminally – is gone, and a new global outfit is calling the shots in Belfast, dragging the danger closer to home than ever.
Cast: who is back and who is new
The core cast returns, including Nathan Braniff (Tommy) and Siân Brooke (Grace). The BBC has also confirmed two notable additions: Cathy Tyson (Dune: Prophecy) and Michael Smiley (Bad Sisters). Strong gets, both.
The confidence level is high
Earlier this year, Nathan Braniff teased that season 3 is the best so far. And Siân Brooke did not undersell it either:
"The writing I think on this one, it just blows it out the water – I don't know how these guys get better and better, but they do."
She also talked up the care put into the characters, and how people want to see where their stories land. Hard to argue with that after the way season 2 left things.
When and where to watch
Blue Lights season 3 drops as a box set on BBC iPlayer on Monday 29 September, with the first episode also on BBC One at 9pm that night. If you need a refresher, seasons 1–2 are streaming in full on iPlayer right now.