We know we’ve been banging on about Britney’s documentary For The Record rather a lot, but that’s because it’s set to be the most exciting thing to hit our TV since Take That’s Do What U Like video. Well, maybe. Anyway, this is the most in-depth preview of the documentary (which airs on Sky1 on 1 December – we’ll be saving our advent calendar chocolate all day especially!) so far, as Britney talks about how her “art” is the greatest therapy…