Thanks for the suggestions but I had already found and disabled high vigilance area alerts (hva) using the method in post 2 though the method in post 3 is a lot simpler.
However the hva audible warnings were still occurring, and extremely annoying, beeping for the whole length of some autoroutes.
Spoiler: This finally disabled them:
Spoiler: So it seems that both of these are needed:
Unfortunately the problem still exists in France, I can see the speed cameras on the map but I don't get any visual or audible popup warnings.
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