BritBox: new in September 2026
September brings one of BritBox’s strongest line-ups of the year. Professor T returns for a fifth season of sharp psychological crime, Marble Hall Murders closes out the Magpie Murders franchise with Lesley Manville at her best, and a two-part Kray twins documentary rounds out a compelling month for crime fans.
Jump to: Must Watch | Recommended this month | Everything new in September
★ Must Watch
Professor T Season 5
Ben Miller (Austin, Bridgerton, Jonny English Strikes Again) returns as the brilliant, deeply eccentric Professor Jasper Tempest for a fifth season of six fresh cases.
Starring: Ben Miller, Sarah Woodward, Barney White, Douglas Reith.
New and exclusive to BritBox. 6 episodes.
Recommended this month
Kate: A Life in Pictures
A single-episode documentary portrait of Catherine, Princess of Wales, told through photography that has defined her public life, from her early years to her role at the heart of the modern monarchy, with expert commentary throughout.
New and exclusive to BritBox. 1 x 60 minute episode.
Holding
Based on Graham Norton’s debut novel, a discovery outside a small Irish village forces long-buried secrets into the open, leaving an underestimated local sergeant to unravel an investigation that runs deeper than anyone expected.
Starring: Conleth Hill, Charlene McKenna, Clinton Liberty, Brenda Fricker.
New to BritBox. 4 episodes.
Marble Hall Murders Season 3
The third and final chapter of Anthony Horowitz’s Susan Ryeland series, in which a manuscript hides a real murder and Susan must prove her innocence while catching the killer.
Starring: Lesley Manville, Tim McMullan, Yasmine Al Massri.
New and exclusive to BritBox. 6 episodes.
KRAYS: London’s Gangsters
A two-part documentary tracing the rise and fall of Ronnie and Reggie Kray, the identical twins who controlled London’s East End underworld through the 1950s and 60s, drawing on archive footage, expert interviews and first-hand accounts.
New and exclusive to BritBox. 2 episodes.
Everything new on BritBox in September 2026
- Professor T Season 5 | 2 September | Series
- Adrian Dunbar: My Ireland — Series 1 & 2 | 4 September | Documentary series
- Kate: A Life in Pictures | 7 September | Documentary
- Holding | 10 September | Series
- Marble Hall Murders Season 3 | 15 September | Series
- The Armstrong & Miller Show — Series 1–3 | 18 September | Comedy series
- KRAYS: London’s Gangsters | 25 September | Documentary
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