My house rules with the Casse are to take things as slowly as possible. Really, really, really slowly. Like capturing one town every 10 years - that's one every 40 turns! That way, it takes 70 years to conquer all of Britain and Ireland.
By that time, 202 BC, the Sweboz, one of the two Gallic factions, the Lusotanns and the Romani will be much, much more powerful than they were at the start of the campaign, and tough enough to give you a serious challenge, unlike the start when they are pushovers.
During the 70 years, spend all your small budget on town improvements. So, a very long and boring game at the start, consisting mostly of clicking the end turn button, but much more fun after 202 BC.
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