In the Chaos following the Bronze Age collapse, a new culture emerged that swept into Britain and forever altered life on the island. (c. 800-50 BC)

Part II of the History of the Celts (covering Ireland) is in the works.

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More information about the Celts came from the follwing:
Historia Civilis - Caesar in Britain (parts I and II) for information on the rise of the Belgae and the Southern Confederacies.
(links to both parts at
https://www.youtube.com/watch?v=LOCBWh5Iwm4&t=21s&list=WL&index=2
and
https://www.youtube.com/watch?v=GrW6epBAz9Q&list=WL&index=2
respectively)
Also does good work on the Gallic Wars and the nature of the Celts on the continent.