Blink 182, Arcade Fire, The Libertines, Guns n Roses, Kele from Bloc Party, Two Door Cinema Club, Delphic, Mumford and Suns, LCD Soundsystem, Billy Talent, Gogo Bordello, Biffy Clyro, Lostprophets, Queen of the Stone Age, NOFX, Frank Turner, Crystal Castles, Enter Shikari, Pendulum, Gaslight Anthem, Modest Mouse, The Cribs, Dizzee Rascal and Klaxons are 100% confirmed for Reading and Leeds.
Ticketmaster ticket link – http://ticketsuk.at/pmsavage?CTY=1&CID=14287
EDIT – I’ll update this as we go!