I was speaking to staff at strummerville last night and they said their TBCs are big artists. And that they can't say because when florence and the machine did a set in recent years it got to crazy. I don't remember florence ever doing a set there and can't find anything on Google about it. So she may be hinting that it's florence. Take it as you will.
Jack White was special guest in the dead weather's in 2009 on the park aswell, along with klaxons and NERD. All have much more wow factor than ezra, who's at glasto every yea anyway.