Those cameras don't take a picture of you, they just read number plates from one to the other and work out your speed as you pass. There are stories that you have to be in the same lane as you pass each one but there are equally as many that say you don't, and that only certain ones track the plates, but again just as many that say they all do.
I go through the same stretch of the M1 at about the same time of night as you on a Thursday going north, and a Monday going south. I'm convinced the things just don't work because of how many people fly through there, but I'm not about to try it myself having 6 points at the moment on my license. I can't believe there would be that many people getting caught in them everyday. The thing that makes me laugh about the whole setup, is that it used to be 40mph through there, and there were so many crashes that they put it up to 50. There still seems to be more accidents through there now than there ever used to be so I'm not sure what they are meant to be achieving.
I don't really get folk that complain about being one of the "careful" people being caught, if you speed, you aint being careful so just take it on the chin. The muppets on the road that use it as a rally track will get what is coming to them at some point, they can't stay lucky forever. Whether you are an occasional or a consistant speeder, you are flauting the rules and riding your luck, luck runs out sooner or later. If someone drove at 50 just once past a school and killed a kiddie, they don't deserve any special treatment IMO just because they had never done it before. FWIW, I suspect you will not hear anything anyway.