I know it's early to start thinking about such things, but is would anyone consider hiring a barn? This is the first place I saw, to give you an idea:

http://www.thorpe-bunk.co.uk/shippon.html

http://www.thorpe-bunk.co.uk/pondside.html

http://www.thorpe-bunk.co.uk/stables.html

Just throwing out options. No tent or cooking stuff to lug about. Just throw your sleeping bag on the back, turn up and party!!