A quick look gives:
Commentarii de Bello Gallico 3.9 Where Caeser mentions Britons joining the Veneti in their fight against him.
Commentarii de Bello Gallico 4.20 Mentions Caeser's reason for invading Britain, ie they were providing assistance to the Gauls.
Now i know this is all long after the start date but i imagine archeology testifies to similar things a lot further back in time. I'm no archeologist so i wouldn't know what sources were used but EB has team members who are so I'm willing to trust their decision in this matter.
You'd have to ask someone from the team for that one too, I got it from the biography of the Casse faction leader (again I'm willing to trust them in this), I'm guessing its from one of the various Irish "Cycles" stories that cover the early history of ireland.Source for the Goidelic legend?
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