I was at Silverstone last friday for some caterham slalom fun (it's held in the car park - http://www.caterham.co.uk/assets/html/experience/slalom.html) which was good fun , only down side was it was freezing, windy, and there was too much waiting around (for me anyway!!) between turns.. During a break for lunch we were able to go to the track and wander around the pit lane / garages - there was formula renault testing going on....enjoy - I did!