I knew an ex Motorcycle Plod who retired and went on camera vans. At the time - there was only one camera and he advised if you were speeding (on a bike) on approach to the camera - the best course of action was to accelerate fully rather than slow down - as he had to jump from the seat at the back of the van - through to the front in order to note down your plate (yes, that was legal).
Since then they have a front, rear and side fish-eye camera and you are pretty much stuffed.