Blue Lights series 4 first look teaser trailer released

The BBC has released the trailer for the fourth series of the BAFTA and RTS award-winning Blue Lights.

Following the release of Season 3 last September, where the Blackthorn response team uncovered a sophisticated drug-trafficking network running high-end drugs through wealthy professional circles, Season 4 looks to answer important questions from the past.

In the new trailer, Constable Shane Bradley (Frank Blake) stops an elderly driver, David (Trevor Gill) and his passenger, Imelda (Rosamund Monteith), in a bid to improve Blackthorn’s crime statistics.

The new season will see the return of central cast members including Siân Brooke (Sherlock), Martin McCann (Hostage), Katherine Devlin (The Day Of The Jackal), Nathan Braniff, Joanne Crawford (Outlander: Blood of my Blood) and Andi Osho (The Sandman).

Abigail McGibbon (Ballywalter), Dearbháile McKinney, Neil Keery (How to Get to Heaven From Belfast), Andrea Irvine (Call the Midwife), Cathy Tyson (Dune: Prophecy) and Michael Smiley (Bad Sisters) are also back.

Season 4 has once again been written by co-creators Declan Lawn and Adam Patterson, who are also writing another series for the BBC, D-Notice.

The project is a political thriller about investigative journalism, centred around the mechanism, D-Notice, which allows journalists to advise the government on national security.

Blue Lights Season 4 will air on BBC One this autumn.