> So we have a fucktonne of speed cameras allover the place: https://www.speedcameramap.co.uk/ (you need to zoom in there are so fucking many)

Doesn't seem that many compared to what I was describing. At the scale of a country, "a lot" != "a high %".

Your point 3 is the biggest divergence between them.

Point 5 is only kinda true, the failure mode is weird: there's good reasons why the speed limit isn't enforced until you're significantly over it, but that in turn means it has to be set lower than physics and reaction times dictate, which in turn means people push back against them. 20 zones knowing people will do 25, chosen because if they were 30 zones people would do 35 and 35 is too fast, that kind of thing.

People who know that, let themselves go a bit over the limit; but a bit over means they get caught some of the time because of the same small occasional variations that are the reason why the speed limit isn't enforced at x+1 mph in the first place.