Also, http://thisistruck.com/ox4-festival-lineup.aspx has general timing of bands up.

Action Beat
Andy Letcher
Baby Gravy
The Big Pink
Cat Matador
Charly Coombes & The New Breed
Dalek
Danny & the Champions of the World
Dead Jerichos
Dial F For Frankenstein,
Dusty & The Dreaming Spires
The Gullivers
J4G
Jali Fily Cisshoko
Jane Griffiths & Colin Fletcher
Jonquil
Maqam
Matt Sage
Mr Fogg
Mr Shaodow
The Original Rabbit Foot Spasm Band
Ralfe Band
The Reverenzas
Richard Walters
The Scholars
The Selenites
Stricken City
Su Starling
This Town Needs Guns
Ute
Witches

+all sorts of other shit, like UnConvention Oxford, Free Beer Show comedy, Hammer & Tongue, and the Truck monster - http://tinyurl.com/pictureofthetruckmonster