I am trying to get a grip on the Spitfire Pilot doing a low pass (no matter what he called it) instead of being at 500 Feet which is supposed to be the standard height for the Maneuver he asked permission to do.
He may not have violated his DA authorized height but it would seem he did violate a standard and accepted height for the Break maneuver he asked for.
Whether the Helicopter cleared the runway or not....for what ever reason...the airplane was obliged to do a go around and stay in a closed circuit pending additional instructions from ATC or it would seem.
Until clear of the Runway....it is the "landed" aircraft's runway....not the "landing" aircraft's.....but to be fair....ATC should not have cleared the Spitfire until the Runway was clear.