This monograph (link courtesy of Don Clark on another thread) may be helpful - I haven't read it beyond skimming the index and introduction, but looks informative. Apologies if not, of course.
https://www.raf.mod.uk/our-organisation/units/air-historical-branch/second-world-war-thematic-studies/flying-training-volume-ii-organisation-part-1-basic-training-in-the-united-kingdom/
Pat
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