Instead of wasting so much energy complaining about getting caught for doing something illegal, why not lobby to get the speed limits adjusted? I'm not talking about 30mph through built-up areas, but, say, introducing variable motorway speed limits so that if it's not busy and not raining you can do 80/85.
"you must travel at 37 if you accidentally do 43 for a yard or two."
Rubbish - a yard or two at 3mph over the speed limit is not going to result in you getting fined.
I'm not pretending that I drive perfectly and never break the speed limit, but there is a calculated risk with speeding. There are some areas where you are less likely to get caught - open motorways for example - and some where you are more likely to - e.g. around roadworks. You know there are speed cameras around, so if you speed you should accept there is a risk you might be caught.
Too many people sit around moaning about what's wrong in the world instead of trying to suggest what might be right. How about some give and take? Reduce urban speeds to 25 but increase motorway speeds to 80.
And in the meantime, if you don't want to get caught by a speed camera, you know what to do - and you might even save some money on petrol too :-)