Blue Lights returns to BBC One and iPlayer as season 4 lands in the UK today
The acclaimed Belfast police drama Blue Lights returns to BBC One and BBC iPlayer on 29 September 2026, with the full fourth series available as a box set on iPlayer from 6am and an evening linear premiere at 9pm. The new season expands the show's focus on frontline officers while centring a high stakes murder trial that threatens to unsettle both the force and the community.