I've got an interesting scenario to bring to the table...
I was traveling South on the A1, at this stage of the journey I'd not long joined the A1 from the Edinburgh City Bypass. All of the journey was done with cruise control set to 60 or 70, where applicable.
There was one stretch of dual carriageway (possibly before Haddington, but I can't be 100% sure) where a line of cars were all doing 60-65mph in the outside lane, leaving the inside lane completely free as far as the eye could see. I got slightly agitated (silly on my part) and went back into the inside lane, where I applied some gas to pass the line and then return to cruise speed. As I approached the front of the line, I caught sight of a marked Volvo SUV sitting at an observation point on the opposite side of the road. I reacted immediately and slowed down, but I'm fairly certain my peak speed was 90mph. No attempt was made by them to turn around and pull me over, but I think I'm right in saying they can still issue a NIP to me via post?
It's possible they weren't even monitoring speeds and were simply just having a break or doing a multitude of other things, right? What's the likelihood that I've been done?
Here's a professional recreation courtesy of Paint.NET:
https://i.postimg.cc/zJCFm2KG/reconstruction.png