Mark, I just checked my old saved emails to try to see how much I paid in 2010, but sadly I’ve deleted them.
I contacted them myself around about this time of year and received a reply fairly promptly, so they should get back to you. I too asked if they could confirm how much I owed and it wasn’t a problem. Sorry I can’t be more help to you. Hopefully see you there for a beer, if I find the money to book this year soon enough!
It’s a really nice campsite and anyone else who’s looking to save a few quid should definitely check it out. But only if you’re happy with a bit of a walk to the circuit.