As a retired professional pilot and long time model flyer, I greatly enjoy Shuttleworth's model days. Long may they continue.
However, any modeller knows that in the wrong hands, a model aircraft can do a lot of damage, particularly at a crowded site such as Old Warden. I have no doubt that the attendants that Dopellganger complains of would have been checking not only British Model Flying Association membership (which brings with it £10,000,000 of third party insurance), but also possession of a "B" Certificate, which is the BMFA's requirement for flying at a public venue.
It would be utterly irresponsible of the Shuttleworth if they did not ensure that all flyers were competent and insured. No one wants to see the Trust sued for negligence after an accident because they had failed to vet those taking part.
Doppelganger seems to think that a good days model flying involves losing or crashing all his models, and that being asked to show proof of Insurance is unreasonable.
It is a small minority of flyers like him who get model flying a bad name. If model flying gets banned at Old Warden it will down to such stupidity.
Either grow up or give up, doppelganger - neither modelling nor Old Warden need people like you.