My only festival recommendation for 2013 is Sziget.
Sziget Festival is a week long festival in Budapest. On an Island in the Danube. In the 30 degree sunshine. With showers. 24/7 HOT SHOWERS. And CLEAN toilets - with toilet paper.
Seriously...why would you go to a cold muddy festival in the UK where beer costs a fiver and the food even more when you can go on a holiday and a festival in a oner for a week and spend the same money!
Hungary doesn't have the Euro which means