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I think professions where the assessment of labour quality has a subjective and/or uncertainty element are more prone to this type of nonsense where accent and connections play a big role. Also those professions with high ‘entry costs’ eg where the way to get a job is through first doing an unpaid apprenticeship or internship (which rules out people from poor backgrounds), and where the starting salary is low (as above, because you need daddy to subsidise you initially). That’s why you’ll never get the best talent in the economy choosing to become barristers, and also why barristers basically all come from the same hugely privileged background.
I've no idea how much it holds people back but my experience of working in film/TV/media wanker land in London's famous London has been of a lot of public school boys/girls assuming you're thick as pig shit because you're northern. I know a lot of people who have 'poshed up' their accent too, unfortunately you seem to get away with being a stiff idiot as long as the nonsense comes out eloquently.