I can just imagine the Public Enquiry, a few years from now:
"So you intercepted the uncommunicative airliner, then what?"
Typhoon Pilot, "Well Sir, we tried everything to no avail. Eventually the only option left was to fire a warning shot across her nose"
"And then what happened?"
Typhoon Pilot, "Everything worked perfectly. I selected my weapon, pulled the trigger and watched my ASRAAM plough nicely into her number two engine."
Now that's being warned!