I can't quite quote personal experiences; however my father was an instructor at No 20 SFTS Cranborne from July 1940 to October 1942, mainly teaching navigation to pilots from the back seat of a Harvard, as far as I can tell.
Was that part of the "RATG"?
Other aircraft he got his hands on in that period were DH Rapide, Oxford, Junkers 52 (how?/why?), Anson and Audax. And DH82, of course, if only for what seem to be jollies with his best friend.
Nearly all the Harvard sorties were "P/Nav test". I'm guessing that the names entered as P2 must be a roll call of students at 20 SFTS.
The Anson sorties were "Astro Practice", with Self as P2.
If anyone wants to see if a name/aircraft number appears, let me know. I don't guarantee to respond quickly, but I probably will eventually.