I know this bit of road and camera Andy. They were working on the two bridges for months and the camera was put up to slow the traffic as the bridges were on a one way at a time system with traffic lights. The limit was/is 40mph but they finished working on the bridges a while ago, both lanes now being open, but they haven't taken the camera away yet! And I know it's been active for yonks as I've seen it flash when I've been approaching it, triggered by cars going past it.
Not sure how he stands there.... he might have a case to defend if he can prove the camera was a temporary one during roadworks, but that might be an uphill battle on the grounds that it's there so it's there to be taken note of. BUT I've also a feeling they have taken the 40 signs away, so that might be his escape. Can he do a recce to see if the signs are gone? (If I'm that way soon, I'll check).
He needs to get some legal advice on temporary camera sites after the activity that called for it has now finished.