where does the posh english accent come from
Received Pronunciation RP is often believed to be based on the accents of southern England, but it actually has most in common with the Early Modern English dialects of the East Midlands. This was the most populated and most prosperous area of England during the 14th and 15th centuries. By the end of the 15th century, "Standard English" was established in the City of London.[16][17]