If the speed was quoted at 37mph your speedo would have been at least 40mph, and you knew the camera was there!
I'm not justifying speeding but get to know the law. There are many types of camera, for example a gatso isn't type approved to get you front facing etc. There are always challenges if you read up on the regs. Half of the old school gatso's have no film in because it's too expensive. Road markings etc, can all have an influence.
I use a dash cam with an inbuilt radar and it picks up many cameras before it's too late, even mobile ones
I've long argued that the speed limit in the UK is too low. Our attitude to driving isn't open and the worst drivers are the slow ones, imo, because they're frightened to fuckin death of the road.
There are some dicks who go to quick, that's because they're brain dead half wits who have no fuckin road sense. They are the ones that kill.
The best drivers are the quickest ones, ask Lewis Hamilton.