I posted the UK legislation recently (with a link to the relevant act) - to summarise: Not below actual speed and within 10% plus 6.25mph between 25 and 75mph.
I think you have failed to understand my comment…
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Just remember speeds limits are a target not a suggestion 
and, certainly, all-bets-are-off if the weather/road conditions are such that achieving the signed speed-limit means one is driving toooo fast. 
The Driver is meant to use common sense and reduce speed according to whatever the situation…
Except that decision has been pretty much removed by lower limits everywhere and proliferation of speed cameras.
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Might well be so in UK…
France has more roadway without cameras, than with 'em …
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Don’t encourage them
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You misunderstand.
I drive with my cruise control set at the speed limit, so I try not to break the law.
My point is, when they were introduced to a location, it was because that location was ‘an accident black spot’ and the camera was used as a deterrant.
However, now they are almost everywhere (OTT, I know), so they are no longer a deterrant.
Badger’s point is that in their ubiquity they encourage evryone to drive at or under the limit at all sites thus continuing to work even at the previously identified black spots.
Unless your contention is that the ubiquity makes people more likely to just ignore them and drive over the limit all the time.
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My point is, they are now not what they were brought into use for.
They are now just a cash machine for governments: https://www.lunion.fr/id476520/article/2023-04-18/combien-dargent-les-radars-ont-rapporte-letat-en-2022[https://www.lunion.fr/id476520/article/2023-04-18/combien-dargent-les-radars-ont-rapporte-letat-en-2022]
Maybe the idea was to reduce the amount of ‘black spots’ by introducing cameras and penalties for drivers going too fast in non-black spots and thereby, hopefully, reduce the appalling number of fatal road traffic accidents. In any event l for one am deterred from speeding whenever l see a speed camera or the Satnav tells me what the limits are.
Perhaps better driver training would help more. On the n159 which I regularly drive there are drivers who do the old cafe racer driving between cameras, slap on the anchors just before the camera and then give it welly afterwards. The mesto cameras being installed now pick up the car/truck up to 400 m beforehand,
Well, yes, of course the revenue they generate goes *somewhere* - you think the government wouldn’t just tax everyone a bit more if they needed.
I like to drive quickly as much (or more than) the next man but the fact remains that excessive speed on the public highway makes accidents a) more likely to happen and b) worse when they do. Effective control of speed saves lives both directly and indirectly.
If you factor out the French obsession for tailgating, otherwise I doubt the 10kph makes any difference at all. Those that hammer it dont generally take notice of speed restrictions, its the normal folk who do.
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No. A setting on the limit button determines the max speed - unless driver ‘floors it’.
Let’s face it… the cameras only “make money” if folk break the speed limits…
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But when you up and down the limits very frequently its incredibly easy to make a costly error. But then they know that as well.
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Exactly, there is no safety reason involved when you leave a 50, which assumes the national limit of 80, only to have to reduce hard only 30 metres further on for an unexpected and sometimes half concealed, 70 sign. Safety would demand that in place of, or in the case of leaving a village, alongside, there was a 70 sign. Somebody somewhere either needs their brains checked or they are out to make money. I know which alternative I believe in.
As regards trusting the limit on the satnav, I don’t, in order to do that you would have to update it at least every day. I haven’t done mine for years and take no notice of it but, I do know that 80 is its fall back position. 
That’s one of the useful features of a navigation app like Waze: it updates itself all the time based on where you are. It manages to do this while using very little data.
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