Pittsextra,
I have passed your post to Andrew Haines. It is well worth his time reading it. although not directly relevant to his challenge. It is the 'grass roots' single aircraft DA pilot owners who are most affected by the vast increase in the permission charge since the 2015 season. Many of the stars on the airshow circuit began as one of them and the increase in cost and the introduction of a time consuming and onerous bureaucratic system will put aspirants off starting their involvement in displays. The very 'seed corn' of future UK airshows.
Thanks for your thoughts