Our 'department policy' allows only two cars and a supervisor car in 'hot' pursuit. There are times when other units shadow, but to be honest you don't need more than that in a pursuit. If one happens to go out of service, fine get another one in: but having the chases we all see on tv with 15+ units imo is silly and dangerous for 'most' (I am NOT saying all) situations. All you do is create a higher propensity of people getting hurt not to mention hurt the rest of the district by taking away cars that should be responding to other calls.
However, actual policy doesn't really have that much to do with how the cars are set up or who drives them. Also, if the videos on TV we colonials see with the driving habits of Brits, I'm not suprised it takes more than 10 weeks to learn how to drive over there