£109 for the day, open pitlane (airfield) :)
I'm going with a few mates, any other SXOC people fancy it? I've done loads of MSE days and I've never seen two cars hit each other or a car hit anything more serious than a cone - says a lot about how well organised they are (and how little there is to hit on an airfield!)
It's near Chippenham btw - J17 M4
http://www.motorsport-events.co.uk