Actually there was no Pilot's Notes General in 1940, the first edition was published in mid 1941 (June/July, I'm not sure about the month).
I have here a Pilot's Notes General (1st Edition), I just checked for anything about negative g cut-out, but didn't find any sentence. It mainly includes stuff about propellers and superchargers, though. Compared to the 2nd Edition it's rather short.
I also checked AP 129 Flying Training Manual Part 1 Landplanes (1937, reprint of 1941) but I didn't find a detailed description of negative g cut out so far.
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