on the M3 on Friday, in the outside lane overtaking three cars, doing about 70/72 mph when right up my behind comes a BMW estate motorway police car. He wasn't flashing at me, didn't have any lights on but just sat right on my tail, so close to my boot to be very very dangerous. I ended up speeding up to get past the three cars even though I was overtaking them at the speed I was doing but thankfully there was nothing immediately in front of me. Once I pulled in he shot past and then tailgated the next car.
Was the driver being a dangerous arse or is he allowed to do that if he is trying to silently catch up with someone else?
Tia