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Everything coming to BritBox in September includes an exclusive documentary, returning popular series and a new series debut.

Check out the list of movies, series and specials coming to BritBox in September 2026 below. In the comments section, let me know which ones you are the most excited to watch.

SEPTEMBER 2

Professor T: Season 5 [BritBox Exclusive Series]

The razor-sharp, obsessively methodical Professor T is back, and so are the murders only he can solve.

Ben Miller returns as Professor Jasper Tempest, bringing his brilliant and deeply eccentric mind to a new series of baffling cases. Season 5 features six fresh investigations, ranging from bloody boxing matches to ciphered letters.

The season also stars Sarah Woodward, Barney White and Douglas Reith.

SEPTEMBER 4

• Adrian Dunbar: My Ireland: Seasons 1-2 [New Series on BritBox]

SEPTEMBER 7

Kate: A Life in Pictures [BritBox Exclusive Documentary]

Kate: A Life in Pictures offers an intimate and thoughtfully curated portrait of Catherine, Princess of Wales, told through the extraordinary images that have defined her public life.

From her early years to her role at the heart of the modern monarchy, the documentary draws on rare and iconic photography alongside expert commentary to trace her evolution as a public figure, a mother and a future queen.

SEPTEMBER 10

Holding [New Series on BritBox]

Based on the debut novel by Graham Norton, Holding arrives on BritBox packed with intrigue, heart and the kind of tension only a tight-knit community can generate.

When a discovery outside the small Irish village of Duneen forces long-buried secrets to resurface, quietly underestimated Sergeant P.J. Collins, played by Conleth Hill, finds himself at the centre of an investigation that unravels far more than anyone anticipated.

The four-part series also stars Charlene McKenna, Clinton Liberty and Brenda Fricker.

SEPTEMBER 15

Marble Hall Murders: Season 3 [BritBox Exclusive Series]

The third and final instalment in Anthony Horowitz’s Susan Ryeland series continues the Magpie Murders franchise with another deceptive mystery.

Lesley Manville returns as Susan Ryeland as the story once again unfolds across two interlocking narratives. When Susan begins to uncover a real-life murder buried within a fictional manuscript, she goes beyond the page to stop a killer while also proving her innocence.

The six-episode season also stars Tim McMullan and Yasmine Al Massri.

SEPTEMBER 18

• The Armstrong and Miller Show [New Series on BritBox]

SEPTEMBER 25

KRAYS: London’s Gangsters [BritBox Exclusive Documentary Series]

KRAYS: London’s Gangsters explores the lives and enduring legacy of Ronnie and Reggie Kray, the identical twins who ruled London’s East End underworld during the 1950s and 60s.

Drawing on archive footage, expert interviews and first-hand accounts, the two-part true crime documentary examines how two men from a Bethnal Green terrace became among the most feared and, in some cases, celebrated criminals in British history.

Check out our ‘Now Streaming‘ page to discover what else is available to stream on Stan, DocPlay, Disney+, and more in Australia.

[Descriptions provided by BritBox]