I highly recommend gems,although not in Dorset,it's not far away,near Yeovil,very social club, everyone is so friendly and approachable,my fourth time soon,very clean, everyone is well mannered and respectful.i always take my camper van and stay over, obviously,if you haven't one bit of a problem,although I have seen people sleeping in they're car.hope this helps,and if you do go,( I go on Saturdays) please say hi.
