In the Movie section of the Daily Telegraph today I found this:
"We both came from [struggling] working-class families - people often don't believe that with me, because I speak nicely - but that is the case." The speaker - Kate Winslet - referring to herself and Leonardo DiCaprio.
Now, I'm not sure but the "struggling" would seem to be an editorial insert for clarification ie all working-class families "struggle" - but who knew this would affect each family member's verbal ability, vocabulary and acumen? Is this a bit of a stretch or is it a recognised phenomenon? More research needed.