They no longer have to post warning notices regarding greed cameras, fixed of mobile, which flies in the face of the Police's declared policy of prevention rather than prosecution.
If they were genuinely interested in safety, they would make such cameras highly visible and never use unmarked cars for traffic patrol - and stop turning the lights off motorways, and mend the roads so they didn't cause accidents........
Ron.
.. and not set laughably low speed limits on roads that are perfectly safe at NSL.

They have done that to the A339 here. I guarantee I could drive the whole length quite safely in an Omega without dropping below NSL*, but, because it gets a steady stream of bikers writing themselves off at 140 MPH, it's a "black spot", so it's down to 50, and even 40 in places.
Now, tell me. If a biker is prepared to accept doing 80 MPH above the NSL, what effect do you think dropping the limit by 10 or 20 MPH is going to have?

* - assuming it's miraculously clear of blue rinsers in Nissan X-trails who appear to drive everywhere at 35 MPH