Seems to me that the base cause of this near miss was the Spitfire pilot's lack of understanding regarding what a military "run and break" actually is (and it is a military procedure). That is more than a little worrying, bearing in mind that the pilot claimed to have been doing this for 15 years! It certainly does not mean that the runway "is his"! The run in for the break should not even be made over the runway in the first place, it should be carried out offset on the dead side, unless otherwise stated in local procedures, let alone at such an extremely low level. The procedure is flown at 500 feet and the rest of the circuit is either continued at that altitude for a low level circuit, or after a climbing break to normal circuit altitude. Downwind and finals calls should be made in the normal places and only the finals call allows the pilot to fly over the runway, for a go-around, a roller or to land.