I just listened to a bit of the BBC4 sessions show, and thought it was truly dreadful, like the "bad" acts they put into TV talent shows just so that we can laugh at them. It was just a tunless muttering and groaning - were it not for the accomplished backing musicians, I'd have had no idea what key or notes she was alluding to.
She seems, in the introductory chat, to think that being 62 makes her into some sort of living legend (I mean,it's not like she's 90!), and I also read her saying that she's created a whole genre of singing - the "Marianne Faithfull genre" (I think that was in the Radio Times). She's utterly deluded, and the Beeb ought to have realised that this Emperor is not wearing any clothes.
I'm absolutely with you, Spot. If I'd been in the audience I think I'd have had to walk out.