Strewth - the CAA certainly seem to have approached supervision of that exercise a tad casually. Given how rigorously they expect pilots, designers and engineers/maintainers of full size aeroplanes to behave and how much fuss has been made about radio control aircraft models and their control, this one seems to have been allowed to slip through rather too easily !
A 90Kg flying object effectively out of control at a public event is a darn scary thought.