Apparently, a southern accent is the 'easiest' for a Brit, especially a Texan drawl. I've read/heard a few actors say this. So I find it interesting that as a native Texan, RZ did a very convincing job with her British accent. I'm sure a linguist...maybe even a cunning one! - could explain the reasons why there's a crossover there.

TH is a cunning linguist in CP, but only an implied one!