Perhaps there is an opportunity for a large UK commercial/civilian run airshow at a suitably located (for punters and display safety) ex Mil airfield. With a few serious investors and sponsors it might turn a decent profit (i.e: Incentive to do it and make it successful). I assume the Mil ones are restricted in their ability to make money for many reasons.
Perhaps they could arrange more than one per year (North and South, etc.), now if only there were a group of people that used to do this every year who are now probably twiddling their thumbs?