I used one of those before, they're ok, make it nice and warm. I don't mind a cold shower to be honest, the problem is finding a space to do it where it doesn't annoy somebody else, or where the runoff doesn't go into somebody else's camp.
either Covoes is short on money or it has some massive headliners for the 2 remaining days.
those pop acts as @Joao182 (blink reference?) said are one hit wonders and gotta be cheap to bring in, alongside all the indie stuff on the heineken stage so far
Re. showers - have a look at the solar shower bags, about £8-10 on Amazon, fill up at the taps - leave out in the sunshine (which there will be plenty of again for next year's Glasto..) and you've got a hot shower ready to go