[Franek Grabowski]

I would say that the silence is caused by another factor - very few researcher ever tried to look into records of training units, and those are often far from perfect. The question is if those claims did happen, and were recorded officially. I can imagine that a training unit, being out of the chain could not file the proper paperwork, or even never attempted to. Being a training unit they couldhave considered it a kind of private business, which could cause an anger of Fighter Command. They had to train pilots, and not to risk lives of precious instructors.