Campsites open in December?

Hi we would like to have a weekend away early December and I'm finding it hard to find anywhere. We store our caravan in a place called Shilton which is in Burford so wanted somewhere about half hours drive from there as its only for a couple of nights and we will be working Friday. We have just got back from a weekend away at CC Moreton in the Marsh. A lovely site but they are fully booked for December. Can anyone recommend a Campsite or CL. Many Sue