The Ting Tings' Katie White claims that she didn't go to the loo for the entire weekend at last year's Glastonbury because the toilets were so nasty. This might explain why they're playing on Friday this year.
She told Teletext: "The at Glastonbury were unbelievably rank. I had sore kidneys by the end of the weekend, from holding it all in. Every time I needed the loo, I couldn't go for retching".