"But, 'glueman', most British Bluesmen are not black sharecroppers picking cotton in the Mississippi Delta - but I bet you don't go on and on and on about it! Class is not so much an "elephant in folk's drawing room" but more like a 'red herring in folk's sea'."

I'll take that bet. British blues bands need some hefty inverted commas to pull it off. Maybe Dr Feelgood (the canvey island act) could pull it off in their pomp though it works when it's adapted and transformed through Prog or Metal for instance into a domestic sound.
I fail to see how you can remove class from the equation when folk emerged as the voice of an oppressed underclass and has been collated and redistributed by Victorian and Edwardian connoisseurs.