I expect he would be planning to file an airprox report. The more details that can be provided, the more likely a successful investigation. Any action taken would be subject to the outcome of the independent investigation. It would certainly not be a case of the RAF prosecuting.
The Airprox Process | UK Airprox Board
PilotDAR, perhaps they should fit the cannons to the Hawks for displays and just shoot down any infringers. Might need E-3 Sentry cover for displays as well.
