I know of Michael Twite that owns the place - he's a landscape gardener and his men did a load of work at our house in SuA about 2004 - I didn't know he was doing the camping stuff.
Various positive comments above are all pretty true : there is an easy and safe way into SuA via Loxley, the Touchdown Cafe at Wellesbourne Airfield (about 400 yards from Michael's place) is a regular push and motor-cycle stop serving the all-day breakfast to die for and the ultimate bread-pudding (it's also an Audax control now and again), there is a Sainsburys about a mile away, a Co-op and 2 pubs in Wellesbourne, a few places of interest around with loads of quiet lanes ... and there's an LBS called Cycle Route Warks in the centre of Wellesbourne village managed by a smashing bloke who's really helpful*
The one possible downside, but only for a few hours, is that there is a MASSIVE market at Wellesbourne Airfiled (the other side from the campsite) on Saturdays and Bank Holiday Mondays (from about 0900 - 1500) and traffic on the main Warwick/M40junc - Stow/Cirencester road gets busy.
Rob
* there's a picture of the LBS manager at left hand side of this post