My father was instructed in no uncertain terms that if he wanted to get anywhere in the legal profession in the 1960s, he'd have to drop his Welsh accent. This was in Wales.

"Some UK accents will hold you back, no matter how smart you are" (2019)

With a Birmingham accent being worst.

https://www.derbytelegraph.co.uk/news/uk-world-news/uk-accen...