At last year's air show at Clacton I think the RAFs input was a helicopter which flew from right to left a couple of miles out. After a minute, people were speculating that it might have crashed as it didn't return. BBMF was there though. The civvies were tame and I put it down to a couple of years being out of practice. Blades will be missed. I think we are becoming a very risk averse society.