We've recently returned from 9 nights in Dorset at a lovely campsite, it cost us £90 for a family of 6 in a lagre tent. The campsite is called Steepleleaze, its basically a working farm with four huge fields in a gorgeous valley, the view are stunning, and there are plenty of level places to pitch up. Loads and loads of space, campfires allowed, wood can be bought off farmer or collected off the floor from woods adjoining site. It's very peaceful with the odd folkey group pitching up and playing some tunes, but the farmer takes no shite (ejected aload of campers after a 4.00 am row). The fascilities are basic, with no showers but if you can brave it for a few nights it is certainly worth it.