MrPedantic“Misunderstanding one another constantly suits the natives. I don't see why it shouldn't suit a non-native just as well.”
Hmm, what did you mean? I didn't mean to say non-natives should learn or be able to understand lots of different dialects perfectly... I just wanted to say that it seems there are a lot of different features to recognize, if a student is really interested. Of course that is true of American English too, but my impression was that BrE was more... non-homogeneous. Anyway, this was off-topic, sorry.