Fighting The Blue, on Yesterday.

Has anyone been watching `Fighting the blue` on channel `Yesterday` which is currently running?
It’s not only a very interesting Battle of Britain series, but also the most interesting collection of Battle of Britain film (and other film) outtakes I’ve ever seen.
It has clips I’ve never seen before. People manning AA guns. A 109 that noses into the ground. Plenty of unseen cockpit shots.
Makes you wonder how much footage was actually taken and still exists from the film.