Those are prime talivan locations, I scared a talivan once on the A30 in Devon, it was half on verge and partly in lane 1, VERY DANGEROUSLY PARKED. I was in lane one and caravans are wider than cars, I was being passed I missed the talivan by mere inches. I saw lorries in front doing the same!!!!
Traffic cops know what they are doing, but speed camera operators I think there is something wrong with a lot of them, I have seen the Worcester one speeding as well!
Couple of years ago I was stopped by the Police just to be warned that there was going to be a speed trap in a particular village, they were stopping a few regulars (as noted by residents to let them know!) I chatted for a while, mentioned what I thought was the best location for doing them, and also mentioned full acceleration from a 2.0 executive will sound faster than it is going up hil out of the village they stoped me near.
Seem them a few times, had a word about lack of lights on cars, they told me they were stopping them, last time they were at my danger spot as I wizzed past at about 25mph.
At work they were joking about my speeding (speed trap in work village) then Mr 45mph everywhere commented that I was carefull in villages and would be unlikely to be done, even though I go quite a bit over on very good visibility roads, but not too fast to stop. Mr 45 thought it was double standards moaning about his driving when I speed myself (where you see white circle and black diagonal)