I said way above, Sugwash, that one positive about Seth's work, in my opinion, is his folkie lyrics but, yes, as you say, another is that, so far, he has not gone for the mid-Atlantic/phoney-American accent - although, I repeat, he does belt-out those lyrics in the American-pop style, his stage-craft is rock, and his hoverfly accompaniment is not very folkie, either.
(P.S: I was actually born in Lancashire the day Alf Ramsey's English team won the World Cup.)