And there you have your problem Matthew. Harriers do not just plonk themselves on and off strips. There is a sizeable support package that goes with them. Vehicles, refuellers, a few 12 by 12s, personnel and so on. Such a deployment does not go unnoticed, especially as you need a road to act as a take off strip. People tend to notice that sort of thing and it would have been commented on. Unless there was an exercise going on, it would be v unlikely. Where would the ac have come from and which sqn would have been operating in support?