Apple TV+ just confirmed the date fans have circled all year: Slow Horses returns for its sixth season on September 16, 2026, bringing Gary Oldman back as the foul-mouthed, brilliant MI5 castoff Jackson Lamb. The new season rolls out one episode a week, wrapping with a finale on October 21, and it arrives with the kind of momentum most spy dramas never get near — a loyal audience, a stacked awards shelf, and a seventh season already locked in before this one even premieres.
The series debuted in 2022, adapting British author Mick Herron’s Slough House novels about a team of disgraced MI5 agents exiled to a dead-end department for their professional screwups. Five seasons in, all of them sit certified fresh on Rotten Tomatoes, and the show has picked up Emmy and BAFTA TV Award wins along the way, with Oldman earning Golden Globe, Emmy, and BAFTA nominations for his performance as Lamb. That’s an unusually consistent track record for a show built around downbeat British bureaucrats rather than flashy action, and it’s part of why each new season lands as an event rather than just another release.
What’s fueling the current spike in attention is the season’s source material and its stakes. Season 6 adapts two books at once, Joe Country and Slough House, the sixth and seventh entries in Herron’s series, with a logline promising Diana Taverner dragging the team into what’s described as a fatally high-stakes game of retaliation and revenge. Apple has also confirmed Season 7 has already wrapped filming, based on the novel Bad Actors, which means the show isn’t just returning, it’s arriving as a guaranteed multi-season proposition, something that tends to pull in viewers who’ve been on the fence about starting.
Oldman anchors all of it, with Jack Lowden, Kristin Scott Thomas, Saskia Reeves, Aimee-Ffion Edwards, Christopher Chung, and Joanna Scanlan rounding out the returning ensemble. The show was created by Will Smith (the British screenwriter, not the actor) with Herron’s novels as the backbone, and its yearly September release pattern since Season 4 has turned into something viewers can actually plan around, a rarity in a streaming landscape where gaps between seasons often stretch two or three years. Six seasons in, Slough House hasn’t gotten any more glamorous, but the people running it clearly aren’t going anywhere.
