From Wikipedia

The Adventure Of English

Episode Seven

Enriched By Other Cultures

British linguists distinguish dialect from accent, which refers only to pronunciation. Thus, any educated English speaker can use the vocabulary and grammar of Standard English, but different speakers use their own regional accent, or Received Pronunciation, which within the U.K. is considered an accent distinguished by class rather than by region. American linguists, however, include pronunciation differences as part of the definition of regional or social dialects (better called varieties).