only trouble i've ever had in the car parks is
1) can never find the car when i go back 4 my 2nd load (hang a beer can or a flag on the aerial)
2) the car park is a very private place for some of the less salubrious glastonbury goers to ... erm.... GO (if you know what i mean). i recommend u check the surrounding grass before you dump your rucksack on some dirty sh*te's dump.
cheaper by the dozen?? only i can get a carer pass in 2013 ;)