Nothing new here. They've been using the Lakes for practice as long as I can remember. Dunmail and the vale of Keswick always seem to be popular as does Borrowdale. I remember being up on maiden moor a few months ago when the jet (Tornado?) went down the valley below me. You could actually make out the pilot.
The most disconcerting thing I find is that you don't hear them coming. Thankfully I have not been anywhere perilous when they do as they always make me jump!