Today I had a closer look on the cameras. There are two - one just before J8 and another just before J9 (both M1 southbound - could not see anything northbound).
It is difficult to spot them unless you are careful. While approaching the gantry, you could see spec like cameras facing you between two electronic boards (the one where reduced speed limits are displayed). There is one such spec camera for each lane. I think this camera triggers the bigger camera flash to catch your rear number plate when you crossed the gantry.
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