I've never had a "season ticket" for an entire festival -- I just pick and chose what I want to go to. Plus you're only 45 miles away from the venue -- why not commute rather than camp? (Even though I realise you might be calling on your non-drinking good lady to do the driving home).

Go to a couple of concerts and just hang out the rest of the time. You might have a better time of it anyway.

(This said, there's no way on god's clean earth that me and the other ½ would pay £130 for a weekend's entertainment before booze costs were taken into account).