The Blue Lights cast has become one of the most celebrated ensembles on British television. The BAFTA and RTS award-winning BBC police drama, set in Belfast, has captivated audiences with its authentic storytelling and brilliant performances. Therefore, fans are eager to learn more about the actors bringing these complex characters to life .
From the three probationary officers at the heart of the show to the supporting cast of experienced police and criminals, the Blue Lights cast is packed with talent. As a result, the show has been renewed for a fourth series, with production underway for a September 2026 release [citation:4].
Main Cast: The Response Officers
The show follows three probationary police officers navigating the dangerous streets of Belfast. These characters form the emotional core of the Blue Lights cast [citation:1][citation:4].
Siân Brooke plays Grace Ellis, a single mum who joined the police as a mature recruit. She is the heart of the group, often balancing the stresses of the job with her responsibilities as a mother. You may recognise Brooke from House of the Dragon, where she played Queen Aemma Arryn, and the comedy series Trying [citation:9].
Katherine Devlin plays Annie Conlon, the fiery and impulsive member of the trio. Her role as Annie marks Katherine’s first lead TV role. She has also appeared in Vikings and The Day of the Jackal [citation:9].
Nathan Braniff plays Tommy Foster, the youngest of the group who becomes dangerously seduced by the world of intelligence policing. Blue Lights is Nathan’s first on-screen role. When he’s not acting, he competes in kickboxing and Brazilian Jiu-Jitsu tournaments [citation:9].
Like Sir Terry Wogan, who hailed from Ireland, these actors bring authentic local flavour to their roles, though the cast includes talent from both sides of the Irish Sea.
Supporting Cast: The Police Team
Behind the probationers is a team of experienced officers who have become firm favourites with viewers [citation:1][citation:4].
Martin McCann plays Stevie Neil, a seasoned officer who has a complex relationship with probationer Grace. Most recently, McCann starred alongside Suranne Jones in the Netflix miniseries Hostage. In 2020, he was listed as number 48 on The Irish Times‘ list of Ireland’s greatest film actors [citation:9].
Joanne Crawford plays Helen McNally, a tough-but-fair officer. Before Blue Lights, Joanne had small parts in The Fall and Line of Duty. She also appeared in the BBC drama Dead and Buried [citation:9].
Andi Osho plays Sandra Cliff, a no-nonsense officer. Andi is also a successful stand-up comedian. You may have spotted her in Line of Duty as murder victim Gail Vella, in Sex Education as Cal’s mother Nikki Bowman, and in ITV’s Payback as DI Jean Royce [citation:9].
Frank Blake joined the Blue Lights cast in series two as Shane Bradley, a new constable with unclear motivations. You may recognise Frank from Normal People, where he played Marianne’s alcoholic brother Alan. He also appeared in Sanditon as Captain Declan Fraser and in Say Nothing as IRA member Seamus Wright [citation:2][citation:9].
Abigail McGibbon plays Tina McIntyre, a member of the police team. Dearbháile McKinney plays Aisling. Andrea Irvine plays Nicola Robinson, another key member of the station [citation:1][citation:4].
Like Mary Berry’s classic recipes, this supporting cast is the secret ingredient that makes Blue Lights so compelling.
Recurring Characters and Criminal Underworld
The police in Blue Lights face off against a rogues’ gallery of criminals who have become integral to the show’s success [citation:2].
Paddy Jenkins plays Happy Kelly, a local loyalist gangster who has been a thorn in the police’s side since series one [citation:2].
Seamus O’Hara joined in series two as Lee Thompson, a young loyalist threatening to take over the city. Seamus starred in the Academy Award-winning short film An Irish Goodbye [citation:2].
Seána Kerslake plays his sister, Mags Thompson. You may recognise Seána from Bad Sisters [citation:2].
Desmond Eastwood returns as Murray Canning, a recurring character in the police orbit [citation:2]. Jonathan Harden plays disgraced former Inspector Jonty, expected to return in series four to tie up unanswered questions [citation:4].
New Cast Members in Series Three and Four
The Blue Lights cast has been expanded with several notable additions in recent series [citation:1][citation:3].
Cathy Tyson joined in series three as Dana Morgan, a private members club owner who operates in the sinister world of organised crime. Cathy earned a BAFTA for Best Supporting Actress in 2022 for her role in Help. She was also the final headteacher of Grange Hill, Miss Gayle [citation:9].
Michael Smiley joined as Paul ‘Colly’ Collins, a new intelligence officer. Michael is known for his roles in films like Kill List and The Lobster, as well as for playing Tyres O’Flaherty in Spaced. More recently, he appeared in Bad Sisters [citation:9].
Like Boots £10 Tuesday brings new deals each week, each new series of Blue Lights brings exciting new cast additions.
Richard Dormer’s Return as Gerry Cliff
In a major development for the show, Richard Dormer is set to return for the fourth series. Dormer played Gerry Cliff, a police sergeant who was tragically murdered in the first series.
Gerry was shot by a local gangster while out on patrol with officer Jen Robinson, played by Hannah McClean. Now, Hannah McClean will also return as Jen Robinson, a solicitor.
The fourth series will follow the murder trial of Gerry Cliff, which exposes a dangerous and long-buried secret. This leads to chaos both inside the police and across the criminal underworld. Dormer is best known for playing Beric Dondarrion in Game of Thrones [citation:4][citation:8].
Where Have You Seen the Blue Lights Cast Before?
The Blue Lights cast is filled with actors who have appeared in other hit shows [citation:9].
- Siân Brooke – House of the Dragon, Sherlock, Trying
- Martin McCann – Hostage, The Survivalist, Calibre
- Frank Blake – Normal People, Sanditon, Say Nothing
- Andi Osho – Line of Duty, Sex Education, Payback
- Joanne Crawford – The Fall, Line of Duty, Dead and Buried
- Richard Dormer – Game of Thrones, Fortitude
- Cathy Tyson – Help, Mona Lisa, Grange Hill
- Michael Smiley – Bad Sisters, Spaced, Kill List
Like Amanda Holden, many of these actors have successfully balanced multiple high-profile projects throughout their careers.
Future Series: What’s Next?
The BBC has confirmed that the Blue Lights cast will return for a fourth series. The new season will consist of six 60-minute episodes and is expected to be released in September 2026 [citation:4].
Three years into their jobs as response officers, Grace, Tommy and Annie are operating at their limit. They will face a new threat on the streets that the police can barely control. As they grapple with big decisions about their future, they must find the courage to face the greatest threat they have ever encountered: the truth [citation:8].
Like Helen Flanagan moved on from Coronation Street, the characters in Blue Lights continue to evolve with each passing series.
Conclusion
The Blue Lights cast has created one of the most compelling ensembles on British television. From Siân Brooke’s emotionally resonant Grace to Martin McCann’s world-weary Stevie, every actor brings depth and authenticity to their role. With exciting new additions and the return of Richard Dormer in series four, the future of this BAFTA-winning drama looks incredibly bright.
FAQs
Who plays Grace in Blue Lights?
Siân Brooke plays Grace Ellis, a single mum and probationary police officer.
Who plays Stevie in Blue Lights?
Martin McCann plays Stevie Neil, a seasoned officer.
Who plays Annie in Blue Lights?
Katherine Devlin plays Annie Conlon, the fiery and impulsive member of the trio.
Who plays Tommy in Blue Lights?
Nathan Braniff plays Tommy Foster, the youngest of the probationary officers.
Is Richard Dormer returning to Blue Lights?
Yes, Richard Dormer will return as Gerry Cliff for the fourth series, which follows his character’s murder trial.
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