This is a good (2000) overview of the Dark Ages. This is part of the "Lost Treasures of the Ancient World" series.
It explores the art, culture, society, and technology of:
Dark Age England
The
Anglo-Saxon Sutton Hoo burial site
Offa's Dyke
The mystery of King Arthur
The Anglo-Saxon Chronicle
And more...
However, they had to cram a lot of history and speculation into 50 minutes. Written by David Manson and narrated by John Viner. Directors Bob Carruthers, and Gary Russell.
The presentation gives a blow by blow account of who divvied up what areas on the British Isle and surrounding area.
Other than some good shots of Offa's Dyke Path National Trail there is nothing unique about this presentation.