The only one I know is bridge meadow and is actually right beside the canal bridge in Cropredy was a very basic site when i used it about 10 years ago I left the cc&c due to their constant price hiking on their CS it was a very pretty site post code OX17 1PQ.
There is a cricket ground called long meadow which also used to do so camping but this may only be when the folk festival is on
A day of all things motorhome and campervan. The show is held both in the main indoor arena and across the grounds. Catering, hot drinks and food options are available. Easy access to the site and free parking included. Win one of five pairs of day tickets