allow some kind of search to find sites without certain features, ie tents and not caravans
I want to find campsites which are tent only. I think you can probably do that as you know which sites allow tents and which allow caravans, and therefore which allow tents and don't allow caravans.
Ideally I would like to know of sites where you have to park away from the tent as well.
Basically, I once got the idea that I wasn't on holiday at a campsite, I was actually on holiday in acar park which happened to have a tents, and I've trying to find camp sites where I don't feel like that.