Filming has begun for the fourth series of Blue Lights

Following the dramatic finale of Blue Lights series three on Monday 3rd November 2025, fans of the Belfast-based crime drama will be thrilled to know the show has already been commissioned for a fourth instalment.

After it was revealed last month that Richard Dormer will return as Gerry Cliff in the new series, the script read through took place last week, and now filming has officially started in Belfast.

When did filming start?

Production company Two Cities Television shared the exciting news on social media, posting a photo of the clipperboard from 2nd February. The post was captioned with: 'Series 4 of Blue Lights has officially started filming in Belfast and the cast and crew are very excited to be back at Blackthorn.

'All callsigns standing by, for what is set to be the most incredible series yet....'

Declan Lawn and Adam Patterson, co-creators and co-writers said: “We’re very excited to bring this series of Blue Lights to audiences. It reveals a lot of dark secrets, examines what justice looks like in Belfast today, and ties together the past, present, and futures of Grace, Annie and Tommy in an action-packed story. We can’t wait to start filming it!”

Where will it be filmed?

Although no exact filming locations have been revealed for series four just yet, the show will once again be filmed in and around Belfast, Northern Ireland.

Last week, the BBC shares photos from the official series four script read through, where main characters Grace Ellis (Siân Brooke), Stevie Niell (Martin McCann), and Annie Conlon (Katherine Devlin) all appeared, alongside returning cast member Gerry Cliff (Richard Dormer).

Stephen Wright, Two Cities Television and Louise Gallagher, Gallagher Films said: “We are delighted to get the cast and crew back together for series four and welcome some new faces to the Blue Lights team. The appreciation for the show means so much to everyone involved and illustrates the power of fantastic teamwork.”

Check out the script read through photos below:

When was series four announced?

Way back in February 2024, before series two had even aired, BBC bosses announced Blue Lights had been renewed for a third and fourth series.

When is it out?

There's no word on when series four will be released just yet, but now filming is underway, we suspect series four of Blue Lights could land later this year.

What will series four be about?

BBC say of the plot: 'Three years into their jobs as response officers, Constables Grace Ellis, Tommy Foster, and Annie Conlon are operating at their limit, facing a new threat on the streets that the police can barely control.

'Meanwhile the murder trial of Gerry Cliff exposes a dangerous and long-buried secret that leads to chaos both inside the police, and across the criminal underworld. As they grapple with big decisions about their future, Grace, Tommy and Annie must find the courage to face the greatest threat they have ever encountered: the truth'.

Who is in the cast?

The usual faces from the first three series will all return, as well Richard Dormer, Hannah McClean and Jonathan Harden also returning to the cast. Cathy Tyson, Michael Smiley and Andrea Irvine will also appear in series four.

Actor Richard Dormer, who played the role of Gerry Cliff in series one, will be returning to the show, despite his character dying. Series four will also see the return of Hannah McClean as solicitor Jen Robinson, and Jonathan Harden as disgraced former Inspector, Jonty, in a special episode that will answer important questions from the past.

Nick Lambon, BBC Drama Commissioning Editor, UK & Northern Ireland, then said: “Blue Lights has gripped and entertained millions of viewers across three series and Declan and Adam’s scripts will once again have us all on the edge of our seats. Gerry Cliff was such an integral part of series one so to have Richard Dormer back alongside our talented cast is a dream come true. We are over the moon to be back filming in Belfast, and with so many twists and turns in store, fans of Blue Lights have plenty to look forward to.”

Check out the season four cast below:

Siân Brooke as Grace Ellis

Martin McCann as Stevie Neil

Katherine Devlin as Annie Conlon

Nathan Braniff as Tommy Foster

Joanne Crawford as Inspector Helen McNally

Andi Osho as Sergeant Sandra Cliff

Frank Blake as Shane Bradley

Abigail McGibbon as Tina

Dearbháile McKinney as Aisling Byrne

Andrea Irvine as Nicole

Cathy Tyson as Dana Morgan

Michael Smiley as C3 intelligence officer Paul ‘Colly’ Collins

Hannah McClean as Jen Robinson

Jonathan Harden as David ‘Jonty’ Johnson

Is there a trailer?

At this early stage, no trailers have been released.

Check out all of the Blue Lights filming locations below:

How can I watch Blue Lights?

Whilst we await the fourth series, you can watch all three series of Blue Lights on the BBC iPlayer now. That's 18 episodes!

Now read:

How to watch Blue Lights series 3

Blue Lights: Filming locations across Northern Ireland

Everything you need to know about series 2 of Blue Lights

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