Just got flashed on the m25 after road works, doing an indicated 70 (probably 67-68). The gantry clearly had the national speed limit sign over all 4 lanes. I don't speed. Is this common during road works and if not and I get the brown envelope how can I contest it? I had cleared the roadworks and it was the first gantry after. I did 40 all the way through as did everybody else and then when I saw the National speed limit sign above all 4 lanes and a clear motorway moved over into the left most lane (which was previously closed) and got up to speed again. I then got flashed going under the gantry which had the N/S/L displayed.
Thanks.