He claimed I was 50mph over the NSL, I would have argued that it was an indicated 45mph over the NSL which is actually closer to 40mph over it, and the disparity between what he saw, and what I momentarily glanced down and saw when I shut off came from the much greater acceleration I initially achieved against what his vehicle could muster, and the peak was what he needed to attain to make ground on me (by which time I was already slowing down) Either way, both would have resulted in a ban which whilst not happy with, I would have also accepted as would have been his right to pursue.
I argue that he chose to not do this as whilst I was obviously winding it on, did not do anything which would have caused an obvious and measured danger to other - people usually hit 70 up there anyway.
Going back to Smeggers point, a static cam will never make the judgement of whether the speed is a particularly dangerous act and indeed it is possible for vehicles to tailgate at below the limit and be a real danger to others (HGVs do it all the time)