I did notice a little at the gig, but after listening to the Live In The UK CD I've noticed that, especially when hitting high notes, it sounds like Hayley is really having to strain her voice and it parts her voice even breaks and she can't hit the notes. I'm thinking maybe this is her voice problems playing up again and maybe it will lead to them playing a shorter set to spare her voice? I dunno, but if you listen to it I'm sure you'll hear too, especially in Decoy and at the end of My Heart.
EDIT: Oh God it sounds very painful in Misery Business too. I feel bad for her..