I live in the Greater Manchester area but don't have the accent as I didn't grow up round here.
Have been called 'well spoken' before.
I work in care part time, and a 'professional' role otherwise.
Without mentioning any of my education or other work, a couple of people have told me they could 'tell that I was better educated', and a lady told me that she didn't know why I worked in care as I 'seemed intelligent'.
For some reason I don't think they'd be making these remarks if I had a strong Manc accent, though I could be wrong.
Also a ridiculous and rude assumption that people working in care must be unteliigent and uneducated.