I camped for the weekend when the Silverstone Classic was on. It was the main Silverstone campsite, one roundabout down from the main entrance (and the name escapes me). It was really excellent with a number of food stands, it's own pub and entertainment in addition to the main stage. Excellent security, various kind of pitches available from tent pitches to full motorhome parking facilities, electricity, water etc. I really enjoyed my stay there. Having said that, it was in the middle of summer and we had beautiful weather all weekend. I seem to remember that it cost about £50 for two night's, me, the tent and the Frogeye.