Again, from their website:
"There are VERY few tickets left for this year's festival. We cannot guarantee that there will be any available for purchase on the gate.
Before setting out to Cropredy if you haven't bought a ticket, please log on to this website to check whether or not we have sold out.
For those who have already purchased tickets, you'll be pleased to know that the fields are really responding to the glorious weather we have had this week. It is hoped that most, if not all, of the campsites will be open for business as usual".