Found it, it simply is at the toilets. 

Alkaline Trio 90 Barrington Levy 80 Basement Jaxx 120 Billy Bragg 100 Billy Ocean 100 The Black Keys 60 Carl Cox 100 Chase & Status 120 Chelsea Wolfe 80 CMAT 135  Confidence Man 150 MAX David Byrne 150 Disclosure 60 Everything Everything 110 Faithless 100 Fatboy Slim 100 Four Tet 130 Garbage 100 GOAT 105 Greentea Peng 120 Happy Mondays 80  Hollie Cook 90 Jorja Smith 100 José González 100 Joy Crookes 120 Judas Priest 70 Kasabian 50 Kneecap 120  Levellers 85 Linkin Park 90 Lorde 120 Madness 75 The Maccabees 105  Neck Deep 135 Nile Rodgers & Chic 100 Overmono 100 Pixies 5 (-10) The Prodigy 140 Pulp 150 MAX RAYE 100 Ren 10 Richard Ashcroft 100 Say She She 75 Scissor Sisters 120 Self Esteem 120 Skunk Anansie 100 Stereolab 120 The Streets 110 Super Furry Animals 110 Thundercat 90 Tom Jones 30  Tyler, the Creator 60 Underworld 115 Wet Leg 90 Wilco 85  The Wombats 80 Wolf Alice 150 MAX

I mean she's never going to admit it, but of course she would do a deal...same as Labour would with lib-dems/greens if meant getting into government.

They probably do make more from the festival. But take a look at an aerial photo from any year - there's always a few fields that would be viable for festival related use yet are left empty. I guess they just don't want to deal with the associated hassle.