BritBox’s new arrivals this week are led by Marble Hall Murders Season 3, the third and final instalment of Anthony Horowitz’s Susan Ryeland mystery series. Also landing is The Armstrong and Miller Show, the BAFTA-winning sketch comedy starring Professor T’s Ben Miller.
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★ Must Watch
Marble Hall Murders – Season 3
Marble Hall Murders is the third and final instalment in Anthony Horowitz’s best-selling Susan Ryeland series, continuing the Magpie Murders franchise. Lesley Manville returns as Susan, and the series again unfolds across two interlocking stories, a hallmark of the franchise’s storytelling style. Susan uncovers a real-life murder buried within a fictional manuscript and works to stop a killer while proving her own innocence.
Starring: Lesley Manville, Tim McMullan, Yasmine Al Massri
6 x 60-minute episodes
BritBox: recommended this week
The Armstrong and Miller Show
The Armstrong and Miller Show is a BAFTA-winning sketch comedy series starring Ben Miller, arriving on BritBox alongside Miller’s Professor T Season 5.
Starring: Ben Miller
BritBox: recent highlights
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.
6 episodes
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.
4 episodes
BritBox: everything new in September 2026
Professor T Season 5 | 2 September | Series
Adrian Dunbar: My Ireland Season 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 Season 1-3 | 18 September | Comedy series
KRAYS: London’s Gangsters | 25 September | Documentary
