Blue Lights Season 4: Potential release date and everything we know so far

Blue Lights returned for its Season 3 on September 29, 2025, on BBC One and BBC iPlayer.

The series followed its customary six-episode schedule while going deeply into the storyline. The latest season revealed Belfast’s underbelly, where crime and corruption intermingle with money and power.

The fans’ long wait for the new episodes was worthwhile, as they were not disappointed. The characters were more realistic than ever, particularly Constable Grace Ellis, who found herself in the middle of both the action and the emotional core of the series.

Blue Lights Season 3 hit the mark, as is evident by the online chatter and critical reviews. With how well the show is doing and the kind of impact it’s had, fandom is abuzz about Season 4.

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Is Blue Lights renewed for Season 4?

Blue Lights is definitely coming back for Season 4. The BBC didn’t wait around; they actually gave the green light to both Season 3 and Season 4 before Season 2 even hit the screens.

With the early renewal, fans can look forward to more of Blue Lights diving into its layered stories and complicated characters. There is no release date for Season 4 yet, but if you look at how things have gone before, it’s probably landing in spring or early autumn 2026. Right now, the team is busy writing and filming, and these things take a while, especially with the show’s bigger scope.

Blue Lights sits at #117 on TelevisionStats.com as of November 14, 2025, with a decent engagement score of 5.09. The BBC report says that the show pulled in more than 7 million viewers on average when it launched.

Over on Rotten Tomatoes, Season 3 sits at a perfect 100% from 9 critics. Metacritic gives Season 3 an 80 out of 100 from 4 reviews, making it generally favorable. Looking at the whole series, Blue Lights holds a strong 94% on Rotten Tomatoes and a 92% average from audiences.

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What was Blue Lights Season 3 about, and what to expect from Season 4?

Two years have passed since everything kicked off. Grace, Annie, and Tommy have settled into life racing under blue lights. They are not chasing street-level crooks anymore. This time, they are up against organized crime that wears suits: accountants, lawyers, and all those professionals who quietly keep the criminal machine running.

There is a new kind of threat. The old order, both political and criminal, is gone. Now, a global gang has taken control in Belfast, and it’s not just business as usual. The danger feels a lot closer, forcing the officers to face tougher choices, both emotionally and morally.

The show doesn’t just stick to the job. It digs into the team’s personal lives and the tension that comes with growing responsibilities. The more they take on, the more their relationships get strained.

The Irish Times points to a plot involving a Dublin cocaine gang pushing drugs in Belfast using a high-tech delivery app, so cross-border crime is definitely on the table.

Season 3 goes bigger. Instead of local squabbles and sectarian lines, the team faces a slick, international criminal network, and we get to see how that pressure changes them, inside and out.

Declan Lawn and Adam Patterson, the show’s creators, have already dropped hints about some “brilliant ideas” for where they want to take these characters next.

BBC Director of Drama Lindsay Salt was quoted as saying by TV Guide:

“Adam and Declan have brilliant ideas about where to take the characters next, and I can’t wait for viewers to see what’s in store.”

The media outlet further says that Season 4 should stick to the same format: six episodes, each running about an hour. But when the cast read through the scripts for Seasons 3 and 4, they discussed working on over 12 episodes total. That means we will probably get more time to really explore the characters and their stories.

You can count on seeing familiar faces like Grace, Annie, Tommy, Helen, and Stevie back in action. With more room to breathe, the showrunners get a chance to deepen relationships, push into personal stakes, and pick up some of those loose threads and past traumas that haven’t been settled yet.

Details about the plot for Blue Lights Season 4 are still hush-hush, but the creators sound ambitious. You can expect the stakes to rise, more organized crime, bigger systemic problems, and even more risk for the officers.

Season 3 already tackled white-collar crime, lawyers, accountants, and this “global gang” running around Belfast, so it’s a safe bet that Season 4 will keep exploring how crime seeps into the city’s most powerful circles.

Multiple sources peg Season 4’s release for 2026. The decision to renew actually came early, before some of the previous seasons even aired, which just shows how committed the team is to the show’s long-term story.