RP is a social accent rather than a regional accent and it means an 'accepted' or 'approved' pronunciation of language.
RP is sometimes considered to be a standard accent of British English, even though it is estimated only around 2% of Britons speak it today (this is constantly changing).
RP is associated with the upper classes, upper-middle classes, professionals etc.
RP is usually regarded as the most prestigious of British English accents, within the UK and around the world.
RP has a negligible presence in Scotland and Northern Ireland as well as a falling number of speakers in Wales (divergence).
RP is also a theoretical linguistic concept. It is the accent on which the IPA and phonemic transcriptions in dictionaries are based.
RP is widely used around the world for teaching English as a foreign language, as well as American English.
It didn't take long for RP to be held as the prestigious accent of the royal court and of aspirational London professionals.
RP as a marker of social prestige led to diglossia in London and the surrounding area.
Oxford and Cambridge, as the great seats of learning, also adopted RP, spreading the accent among the wealthy educated elite.
By the 19th Century, RP had become the accent of the public schools throughout England, such as Winchester.
The term Received Pronunciation appears to have been coined by linguist A J Ellis in 1869, and popularised by Daniel Jones in the 1920s.
Lord Reith, the first General Manager of the BBC adopted it in 1922 as a radio broadcasting standard, hence the origins of the term BBC English.
In 1932, the BBC began broadcasting in English overseas, using the RP accent, spreading the accent globally.
RP, like all accents, continues to change, impacted upon by social context. The various terms of RP can be roughly divided into three categories: conservative, mainstream and contemporary.
Conservative RP refers to a very traditional variety particularly associated with older speakers and the aristocracy.
Mainstream RP describes an accent that we might consider extremely neutral in terms of signals regarding age, occupation or lifestyle of the speaker.
Contemporary RP refers to speakers using features typical of younger RP speakers.
Estuary English is a type of accent identified as spreading outwards from London and containing features of both RP and London speech.