German & Allied radar

[Franek Grabowski]

It must be a joke. Some sort of unclear document pre-dating Battle of Britain as a proof of RAF strength? Already during the Battle there was a significant movement of aircraft between Squadrons due to lack of replacements, and as Juha points out, this should be investigated on individual basis. Sometimes Squadrons borrowed aircraft from other ones, so many shortages there had been.
It is obvious that various numbers appear here and there, those trying to prove effectiveness of British industry inflating the number, the ones trying to show desperate struggle doing exactly the opposite.