From an official email just now:

"That's right, a secret bonus band chosen by Belle & Sebastian will be playing in Centre Stage at Bowlie 2.
Please note Centre Stage cannot hold everyone attending the festival so this show will be first come first served, and we cannot guarantee everyone will be able to attend."

Any thoughts on what/who it could be? Presumably no-one too huge or else it wouldn't be on the middle stage.

My dream selections: Arab Strap reformation, or a Sarah/C86 heavy hitter.