Airports should be enouraging spotters in particular those who are regulars, such as at Manchester or Coningsby. They are the eyes and ears of the place.
http://www.tasmanchester.co.uk/man-airport-watch.html
https://www.raf.mod.uk/rafconingsby/...visitingus.cfm
Both sites have phone numbers people can contact the police in case of suspicion of criminal acts.