However, while the song snatch is too brief and indistinct to concoct any theories on, I couldn't say that it sounds particularly like a traditional singer to me.

I thought that too, at first hearing. At the risk of looking a berk when someone finds the smoking gun, there seems to me a hint of RP about the phrase 'house and home' just before the fade-out, and the word 'summer' sounds a bit posh too.