One would have thought they'd be grateful for someone wanting to bring them a static display without charging them. OK, I get that there are now expenses such as insurance, but asking you to buy a ticket? That's just plain churlish.
Air shows only have tickets to sell because people are willing to bring aircraft. Insurance aside and given that the air traffic controllers et al are there anyway when the airfield is open, what other expenses might they justify during an air show?
I remember this creeping in during a previous life at Leuchars. Sad time.
Oh, by the way, congratulations on your long career in flying and (if I read your post correctly) your retirement?
Also, it's generally considered bad form to bump into people (old mates or not) in your Bulldog at air shows. Or did I accidentally misunderstand you?
Good luck!