Just a thought.
This high figure could simply be because the roads were relatively empty in the lockdown period, and drivers were not limited by congestion.
I would not favour speed limiters, I have had several incidents where being able to get out of the way quickly has prevented damage or even injury.
A limiter will only affect the overall top speed, which doe's not help with lower speed limits.
There is nothing like the presence of well trained traffic police to maintain a safe flow of traffic, in the days when they existed, and had discretion, a roadside lecture was very effective, the offence being fresh in your mind, and a few pointers as to how stupid it was were much more effective than a shopping bag full of tickets.
Speed cameras are there to be avoided, so the ticket is because you didn't see it not because you broke the law.
A policeman with a speed gun in clear view, well fair cop, if the gun is correct but there are too many reason why it could be in error.
If a policeman stops some one driving dangerously, because they are driving too fast (no gun involved just his opinion), it feels more just!
It's strange how we think, no maybe it's strange how I think?
On your first point about well trained traffic officers, those days are long gone. Roads policing is not regarded as front line policing by many chief officers despite the fact that traffic cops deal with more death and make more crime arrests than any other department in the service.
And whilst an experienced traffic cop is allowed to give evidence of opinion on a number of matters, most courts want hard evidence which is why most of the technology (Lazer, VASCAR, Truvello, Calibrated speedo etc) have a had all the bugs ironed out over the years and the loopholes have been plugged.
But it is the training (or lack of it) that has taken the hit these days along with the resources that have been depleted.
Then there is deregulation, so the councils are no longer required to consult anyone, and they are banging in lower limits which are unreasonable, not required because there was no issue in the first place but allows their expensive traffic engineers to justify their existence.
