What do you think of this one?
Cotswold Farm Park : A Rare Farm Treat in the Heart of the Cotswolds
More details can be found here:
Cotswold Farm Park , Cheltenham Campsite
There seems to be plenty to do on-site if anyone brings kids and there's a wildlife walk. Not that we won't be doing our own...
Or there's this one, which has it's own pub/restaurant, JAMES

(and a new toilet block, hurray!)
Touring Parks Gloucestershire - The Red Lion Inn Gloucester for caravan and camping - Touring Park