BBC Scotland have had a few issues like this with their soap "River City "Similar thing, but on Emmerdale a lot of the actors are clearly Lancastrian, and on Coronation Street they’re from West Yorkshire,there was even one actress from Barnsley at one point, but she is very well spoken, she would have needed subtitles if she spoke as most folk from there do! it doesn’t annoy me, as much as bemuse me, as obviously other regions would never pick up on it,
It's supposed to be in Glasgow but the accents can be all over the place, in the same family.