Some of the bits and pieces which make Festivals easier for me. Some before the event and some during but all giving a little something to make my life easier. Hopefully some may help you too. We have used Paultons Caravans for a couple of years and really appreciate them. They may be a little more expensive than some of the others but the comfort is worth it.
The site has a couple of shower blocks.
There are local shops in the vicinity which can provide many of the needs we all forget to pack.