My opinion only.
I was clocked at 97mph on the motorway coming out of Scotland a few years ago. The Speed Camera van wasa parked on a flyover looking down a curve in the road.
My speedo (Renault Megane) was reading 80mph which my passenger confirmed and there was a vehicle overtaking me in the outside lane while the inside lane was clear (I'd just overtaken another vehicle & had yet to pull in).
I wrote to them stating these facts as I saw them, requesting a copy of the photo/video, confirmation of the specific speed measuring device and that it had been calibrated that morning.
What I got back was a very short response stating that this information would only be made available at court and that if I wanted to avoid the cost of attending court, with all the associated travel costs & hotel accommodation, to accept the fine & points.
This letter was hand delivered by a PC from the local constabulary (under instruction of his Scottish colleagues to make sure I got it) who informed me that the Scottish police were bastards & would pursue this all the way to the courts if I didn't hold my hands up, which I did. 3 points £60 fine for an alleged 97mph.
Unless you've already got 9 points, I'd just suck it up & accept the points & £60 fine, it's by far the easiest option for your bank balance.