I wonder, perhaps, that those clambering to suggest it should have contained more from coastal command, or whatever other branch/section/theatre are missing a point. I’d suggest that a decent number here are pretty well read in their field of interest and for us as viewers would we have learned anything more than we already know in perhaps a few minutes given to other areas? I suspect not.
As somebody who has worked over 30 years in aviation, is a lifelong enthusiast and have volunteered for a similar period in aircraft museums and organisations, I don’t think that there would be much a 90 minutes could tell me than I knew already. BUT…. 90 minutes including some wonderful GoPro filming from a Lysander, Typhoon, etc. etc., now that was worth watching as it is something I wouldn’t have seen or experienced otherwise.