Received Pronunciation

https://en.wikipedia.org/wiki/Received_Pronunciation

Received Pronunciation RP ACCENT

https://www.britannica.com/topic/Received-Pronunciation

Learn the modern British RP accent, syllabus for British Received Pronunciation training

What British accent is RP

https://www.engvid.com/the-rp-english-accent/

https://www.wikihow.com/Speak-the-RP-English-Accent

https://www.actorsdialectcoach.com/post/british-rp