The BBC has released the official trailer and artwork for the fourth series of the multi-award-winning Blue Lights, which returns to BBC iPlayer and BBC One this autumn.

Blue Lights returns for Series 4. Watch the First Look Trailer.

Cathy Tyson (Boiling Point, Dune: Prophecy) and Michael Smiley (Bad Sisters, Censor) have joined the cast of the BBC’s Blue Lights as filming begins on the third series of the multi award-winning Belfast-based drama.