Sorry to say but on that basis I think you are surviving on borrowed time, in Surrey we see them 'hide' the vans round corners behind hedges etc so that by the time you see them, or the laser picks up the signal, you over the limit you are done. Also, how to you expect to avoid the rear detections - when they are on bridge you have just passed under and its width means you can't see them standing on the far side
When you feel the need to 'exercise the right foot' just make sure, as far as you can, it is on a road where the chances of detection are remote.