Allowing anyone to try out your own c5 is always the decision of the individual c5 owner. It is not something that we advertise, and it is something I'm not keen on promoting - we found a lot of people showed the c5's no respect at all and just wanted to race them. We've been lucky not to have any injuries or damage caused, so I would say be very choosy about letting anyone try out a c5 that you own.
Brooklands provided us with relevant cover when we held a try a c5 event, other than that it is down to the individual to arrange if they want to.
Exhibiting bicycles, which is the category we come under, doesn't seem to require the cover that motor vehicles need.