<P> 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 . </P>
where does the posh english accent come from
it actually has most in common with the Early Modern English dialects of the East Midlands