The Yew Tree at Chalvington (not the Arlington one - they're within a few miles of each other) is nice.
You can camp in the pub garden and round the edge of the cricket field. Very nice pub grub. A couple of brick built outdoor loos are left open all night and I've never had them run out of toilet paper. No showers though.
Can be busyish if they've got a wedding on in their big marquee.
Normally nice and quiet, meant to be no music etc. Did have one occasion where a large group were noisy all night but that was the exception.
Near Eastbourne/Brighton/Lewes.