Earlier quoted context omitted.
You mean RP: http://en.wikipedia.org/wiki/Received_Pronunciation
I've never actually heard that term before, though I am familiar with it being called the Queen's English, and BBC and Oxford English. But commonly it would be considered "upper class" within England, and probably considered "English" outside the UK.
Personally, I have a 'perfect' RP accent (according to the Cambridge linguistics people who recorded me). But I find the whole class-antenna thing really irritating. So much so that I live in New York, where people just know I'm foreign, or putting on a fake accent.