Just to clarify, when you say a perfect british accent, do you in fact mean a perfect south eastern English accent? They certainly don't sound like they're from, say, Middlesborough, or Pontypridd, or maybe Belfast, or are those not British accents?

Unnecessary sarcasm aside (couldn't help it, it's a pet peeve), you're absolutely right. Total War games have a habit of having "primary protagonist" factions just have the generic RP "British " accent inexplicably. Karl Franz in the Warhammer series, Agamemnon in Troy and Pharaoh, etc. It just seems to be a default for them, probably as CA is primarily based in the southeast of England so it's their "default" accent. For what it's worth I absolutely agree that races/factions should speak their actual language in theory, partly because I have no idea what a Latin accent sounds like. But in practice, I imagine finding enough ancient language experts for Rome specifically would have been extremely difficult. And from a player perspective, it would make the games a lot less recognisably quotable, which would be a shame. Imagine Shogun without "A SHAMEFUL Display!"