I used to drive 90-95mph on NSL roads.
For 20 years.
Never caught speeding, never pulled, and you can't tell me I've not gone past a few unmarked cars in that time but.....
I never drove aggressively, and always left plenty of breaking distance.
The closest I got was westbound A14 somewhere past Bury St Edmunds, middle of the day, sunny warm day, road was very quiet. Doing 90+ I see a car come up behind me, as I start to indicate to move left to let him past he turned his lights on. Overtook me as I backed off a bit. Then turned lights back off, and proceeded up the next slip road maybe 500 yrds ahead.
Actually once on the A1 southbound literally under the M25 bridge, doing 90+ odd, overtook what I thought was a very ordinary grey Vauxhall Mariva, and a bloody Audi R8 up my backside.
As I go past the Mariva, with the R8 up my backside I indicate and pull over left to let the Audi go, the Mariva now behind me fires it's lights up, overtakes me and pulls the Audi about a mile down the road.
I've had something of an epiphany in recent months though, with fuel price and thinking about the environment and how resources are limited I have slowed right down now, and my new speed is 65-70 on NSL, I'm one of those that is driving for fuel economy...I know getting old and boring.
I still let rip on my motorcycle though, not that I ride it that much these days.
Edit: actually thinking about it I'm more of a 60-65 guy, don't often go more than that last few months.