nobody is ever the finished article. that's when you retire.

it also seems bizarre to diss Sunjay Brayne for a "mid atlantic accent", when the clips I've just watched on YouTube reveal someone singing largely in a (rather middle class) english accent, vaguely reminiscent of Nick Drake's.

Yes, some bits of an American accent on some lines, but really... not as much as any number of respected esteemed UK bluesmen and women of yore... eg Duster Bennett, JoAnn Kelly, Dave Kelly, Gordon Smith, Christine Perfect et al.

The only British singers I can think of off the top of my head who sang/sing in an entirely non-American accent are Ian Anderson and the Boycott Coca Cola Experience. (And maybe the Flying Lizards on their cover of "Money")