Received pronunciation - RP
It has also been called ‘the Queen’s English’ or ‘BBC English’. In the past, RP had high status in the UK, indicating an educated speaker, and this transferred into EFL where it has been used as a model for pronunciation. With the emergence of international English, the recognition of the equality of a variety of accents, and the emphasis on authentic communication, learners now become aware of a wider range of accents.
Example
In RP bath is pronounced with an /a:/ sound. In other UK accents it can be pronounced with an /æ/.
In the classroom
Using authentic listening texts is one way to expose learners to a variety of accents. Sources for this include films, online radio broadcasts and podcasts, and guest speakers.
Further links:
https://www.teachingenglish.org.uk/article/global-english-teaching-pronunciation
https://www.teachingenglish.org.uk/article/teaching-pronunciation-phonemic-symbols
I'm a pronunciation teacher who speaks RP and I've had hundreds of students who came to me specifically because I speak RP. This is because they say I'm easier to understand and they want to be easily understood. I know this isn't fair for non-RP speakers but it's a fact. Some accents are easier to understand than others. I'm happy to teach a variety of accents to anyone who wants to learn but my students always want RP.