Is UK Airpower actually useful against insurgents?
No.
In regards to insurgents specifically, we are simply dealing with the symptom, not the cause. It's analogous to treating a ruptured Aorta by applying band-aids to where the blood appears. But the Aorta repair requires much more moral fibre and resolve than either George or Tony's lot has ever displayed. Would Airpower have worked down the Falls or Shankhill Road?