Good campsites in the south east without loads of restrictions, particularly noise?

Me and a quite large group of friends all aged between 20-24 are looking to go camping in the south east this weekend (possibly kent, sussex, etc). We will have 2 campervans and a few tents. We would like to have a campfire and will probably be quite noisy, as would like a bit of music, anybody know of anywhere that isn't too strict?