'Pride and Prejudice' used 'our mother' then it modernised it to avoid a jarring effect

yep, thats what i figured, didnt work though, i remember it cuz the expression sounded very odd coming out of a middle class home counties woman, even if she was from the early 1800s.
do other countries, english speaking or otherwise have such a finely tuned class/education/region ear? i can place a mancunian to a square mile usually, sometimes to within a few streets. north west by borough and every one else i can make a fair guess at region, upbringing etc. i think this is pretty normal for an english person, and almost totally unconscious. what do you lot think?