Bob V,
I must agree with you, I think it was pretty good that there was an F35 at Fairford at all! They have more important things at the moment, I suspect. I also know from experience (yes, long ago!) that it takes a while to work up and produce a credible display, and I am sure that, in this day and age, that is probably something that needs possibly more finance/airframe and pilot time than is available at this stage. Maybe next year!!
Bill