Mr Munro,
Please explain, if there was no risk of collision, why the 737 took avoiding action. Surely there would at least have been a breakdown in separation had they not done so? And to have the 737 visual at all "relevant times". I admit I don't know the relative flight paths but a 250 kt "speed limited" 737 sure can creep up pretty fast. I believe it would have at least been prudent for the single engine driver to speak up.
I'll have to wait for the report to know the facts. And as far as near misses go, it won't be the first or last time an aircraft which has been the cause of avoiding action will claim it saw the other aircraft.