I've always changed them to cavalry, historical accuracy be damned... chariots are an absolute pain in the behind.

I've always doubted the historical accuracy behind the ancient British tribes and chariots anyway. Not saying they didn't use them, we know they did, but just because we have 1 or 2 battle records where the top banana sat on them, doesn't really mean they used them in every single battle for centuries and centuries.

Plus, with all the contact the ancient British had with people through the years, and what with the fact that absolutely every single other people on the known earth rrealized the importance of cavalry and used it in some way, even light cavalry, i just can't see the British people the only people on earth (on the EB map) not to use cavalry.