Mole, I live 3 miles from J36 so have become well acquainted with the cameras you mention.
But what I also noticed on Friday was a plethora of digital fixed cameras that have suddenly sprung up to enforce the temporary limit in the next set of roadworks north.
What with watching for these, and the SPECS cameras, and for the dreaded talivans hiding on the bridges you barely have a moment left over to glance at the road. Or is that the idea???
Given an experience a year ago when I was wrongly accused of speeding by a SPECS camera I'm very wary of the things now. Unlike
any other form of mechanised enforcement there seems to be no proper means of corroboration of their reading, so if you go through one that is improperly calibrated, or perhaps "glitches" and gives an incorrect reading then basically you've had it. I know it's entirely wrong, but I have to admit that if the opportunity presents itself I will make a point of keeping the vehicle in front between me and the camera as I pass them. That's not to say I'll then go blasting off and ignore the limit, in fact I'm pretty studious in obeying motorway temporary restrictions and always have been, but I just no longer have any faith in this system to take an accurate reading.