One thing I did learn on my patronisation course is the sort of distances their gear works over. Not sure half a mile would be enough......
but the cop cars I have seen are unmarked and all you get to see is the blue lights hidden behind the grills when they start to flash with the headlights when they are in pursuit.
Unless you have Target Blu Eye fitted (TETRA Comms detection), and then you'd know they were there from half a mile away.

My last set of points were picked up at just under 700m, as I came over the brow of a hill

And, yes, I am a reformed character, and I was officially doing less than 70mph on a rural dual carriageway. Its just I refuse point blank to obey HS2's stupid road speed limits they have whilst they spend 4 years to build a single bridge. There is no need for the speed restriction, as, lets face it, they are definately "working out of sight", just not anywhere near the bloody unfinished bridge.

