Just curious really. On my M40 journey, returning from the Rebellion/SRR dyno day today there was a marked Volvo police car ahead. In view of this, most of us were doing 75mph, as was the police car. The police car then sped up significantly and moved to lane two - lets say he way doing 90mph, as he began to draw away from the pack. Rather bizarrely, a Q7 driver broke ranks and increased his speed, tailing the police car, initially at a distance, but eventually, more closely. The police car slowed down again, returned to the inside lane, and the Q7 did too, soon passing the police car, but at a sensible speed, along with other cars. As soon the Q7 pulled in front of the police car, on went the lights and by the time we passed them both, they were pulling onto the hard shoulder. Now, what the Q7 did, by tailing the police car was pretty dumb and he was obviously speeding by matching their speed so: Do you think they would have pulled him by way of a caution, without any measurable evidence, or are there rear facing speed cameras in police cars these days?