Sadly the correct answer but considering there are some 500yards stretches in London where the speed limit change 5 times.
Don't trust it, you will get caught, it misses loads, and anything new no chance.
It's an APP it's not live like a speed camera detector, it's up to you to believe it or not, I know it misses loads and they are live all right , London in particular it misses some and they are all live.Is it more intelligent than you think. Maybe it doesn't detect when the camera isn't working so there's no countdown or anything.
It's got to pick up on something from the camera and if the camera isn't working then it won't register?