IWM supplied the airfield, the management running the airshow would be responsible for all of the applications and licences required to hold an airshow the same as in the old Fighter Meet days at North Weald, Epping Borough Council owned the airfield but the company running the show ( their name escapes me) did everything from the running of the show, fencing, AA  road signage, fuel bowsers, toilet facilities  etc anything to do with running a safe compliant shoe even the people managing the tickest on the gate to the ATC cadets parking and I bet a majority of the same applied at Duxford under IWM terms and conditions.

I know there are people looking in here that have the full story, I have part story.