I felt a bit guilty watching channel 5 reality show, as most of it seems to be making entertainment out of travellers and people on benefits. This instance was police interceptors, and got huge thrill watching three unmarked BMWs stop a Vauxhall MPV. It was a bit of a let down when I realised what they were chasing. The lead character was a black M140i. It was doing 160, and seemed rock stable. I got the impression it was speed limited. Are the speed limiters left on the police cars? I always thought they were specially tuned, and not stock. The rest of the cast turned up; I think M3s, but not sure.