And also due to the inclusion of bombing ranges like Berners Heath and Dengie.
I have a few pre-war maps from different dates and up until 1940 all showed areas dangerous to flying. This is important for researching bombing ranges as few are mentioned in official documents - e.g. No Mans Land Fort in the East Solent.
No Amount Of Evidence Will Ever Persuade An Idiot (probably not Mark Twain)
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