Byker.
I think I get your point.
National Guidelines are the reason why you go in the book for speeding at limit +10% + 2 mph. Wouldn't it be better if it was discretionary?
Thats the biggest issue Police as an entity faces these days, to may prescriptive guidelines, too much process, not enough reality.
So no, I wouldn't agree with guidelines being either enshrined in law, or being national, in reality I'd prefer most of them to be binned. But there are there to absolve those in the higher echelons of responsibility when things go wrong. They simply lean back and mutter "Well, they've been told".
The law provides for, in the case of excess speed a defence for Police Officers. Thats wide enough to account for most eventualities. To try and narrow that to silly prescriptive practice is nothing short of lunacy.
As an example, your home is being broken into, you are being attacked by Billy the Burglar, and not giving a good account of yourself. There is only a basic driver on duty and he's 15 miles away. The roads between you and him are all urban, with 30mph limits. At a speed of 30, not taking into account he has to stop at every red light, accord precedence at every pedestrian crossing it will take him 30 minutes to get to you. Now are you happy with that idea? I am reasonably certain if that happened you'd be on here screaming from the rooftops about how long it took police to turn up. Yet it's only a guideline stopping him from going faster, the law says he can.
Same circumstances, but an advanced driver in a station van. He's done everything he should prior to taking the vehicle out, including a moving brakes test, but it's the first time he's driven that vehicle. an hour after he's left the station, and yours is the first call he's taken. So blues/twos on and he's off, at 40, he brakes for a junction, and there's a loud bang from the back of the van, and the vehicle lurches so violently to the left it mounts the pavement and kills someone. Can't happen? It can, apart from the pedestrian, it's exactly what happened to me, but I only killed a bollard! Had I (in my case I didn't have the opportunity, I'd been going to minor incident after minor incident for the first hour)or my fictional driver been able to do some proper famil with the vehicle, then the fault with the vehicle load sensing spring would have become apparent, and the vehicle take off the road. But the Guidelines say now you can't do famil, and besides, you think it's playing, so nooooo can't have policemen doing that can we, and BSM doesn't like it, he thinks its driving like a 'prat'. But the law sensibly allows for it , there's case law on police driver training.
The problem here is that some people think because aren't allowed to do things, no one should be able to. Throw in a baseless assumption of 'playing', because they don't appreciate that to drive fast you need to have confidence in your own ability and the vehicle and that confidence isn't based on the car having a steering wheel alone.
So you get what you wish for, but with that wish comes consequences, and the full consequence of process and guideline based policing are yet to hit.