The single most important accent in Britain is Received Pronunciation (RP). This accent is not associated with any particular geographical region. It is the accent spoken on formal occasions, and is associated with a high level of education. It is sometimes called 'BBC English', though many speakers on the BBC do not use it, and sometimes 'The Queen's English', although the Queen herself has a fairly extreme or 'marked' version of it - marked RP. (It is also true that the Queen has changed the way she speaks during her reign.)
- You may also like to see AWE's article on the United States equivalent of R.P. at General American.