A link to the discussion of RP (Received Pronuncation) from the British Library's discussion of language. Check out the rest of the tabs while you're there.
PhoTransEdit (English Phonetic Transcription) Text to Phonetics
International Phonetic Alphabet (IPA). (Received Pronunciation or RP, the accent native to parts of south-east England and often misconstrued as the 'educated accent' of the UK).
Received Pronunciation - Wikipedia, the free encyclopedia
The English Language Received Pronunciation 360
Received Pronunciation - Wikipedia