I read and enjoyed a series of historical fiction books in which the central character was a Roman living during the time of Augustus. The author did a good job of making it historically plausible, but it's wholly fictional with real historical events only as a backdrop. The central character is a low grade plebian who has the very sensible (for the time and place) policy of staying well out of politics. The books are mainly detective stories. The Falco series, by Lindsey Davis.
Anyway...the bit relevant to this thread. Part of the first book is set in the newly Roman province of Britannia. There's a passing comment from the central character about how one of the natives, from a tribe from another part of the province, spoke Latin with the most annoying accent he'd ever heard. In the audiobook version they gave that character a Birmingham accent.
EDIT: Man, I was tired when I posted that yesterday. The emperor in the books was Vespasian, not Augustus. A significantly different time. Although staying well out of politics would still have been a sound plan.