9
BBC Four tonight
Tuesday 25 August 2026 · Freeview channel 9
In prime time
21:00How the Celts Saved Britain
Dan shows how in the 5th century AD Roman 'Britannia' was plunged into chaos by the arrival of Anglo-Saxon invaders. As Roman civilisation disappeared from Britain, a new civilisation emerged in one of the most unlikely places: Ireland. Within a few generations, Christianity transformed a backward, barbarian country into the cultural powerhouse of early medieval Europe.
Followed at 22:00 by: Britain in Focus: A Photographic History
The full evening
15:55This Is BBC Four
19:00The Architecture The Railways BuiltMotoring · 45 minDocs
19:45Flying Gardener
20:00To the Manor BornRomance · 25 minSeries
20:25Keeping Up AppearancesSeries
21:00How the Celts Saved BritainHistory · 60 minDocs
22:00Britain in Focus: A Photographic HistoryDocumentary · 60 min
23:00The Secret Genius of PlantsNatural World · 55 min
23:55Do We Really Need the Moon?Science · 60 minDocs
00:55Flying Gardener
Tonight's evening schedule for BBC Four, Tuesday 25 August 2026, from the early evening slot through to late night. All channels are onTV tonight; tonight's cinema is onfilms on TV tonight.