SPECS on M1 J26+

[V8LM]

During the widening of the M1 north of J26 a number of SPECS cameras are in place southbound and gantries, but no cameras yet, northbound. However, I noticed that the cameras on the gantry just north of J26 are both directed at the opposite northbound lane, but still facing north so they see the back of the cars not the front. All other cameras on the gantries are pointing at the southbound lane.

Any idea what is going on?

Oh, and whilst I'm here - what proof is given as to the speed limit in place in variable speed limit regions of the motorway, specifically the M42? Either me or a car behind was flashed doing 70mph under a gantry that was displaying the national speed limit.