Well, our police use BMWs, Range Rovers and years ago they used Jaguars, all those are more expensive than Lincolns (Town Cars start at $40,000, that's a mere £20,000, to us that's dirt cheap for a car like that). But then our police forces probably don't buy cars in the same quantities as the American police departments (if all those movies are anything to go by), and they use a mix of small cars and larger, fast persuit cars, whereas every cop in America seems to drive a huge Crown Vic. Although of course it makes little sense to use Town Cars, they are more or less a luxury version of the Crown Vic, they aren't any faster, whereas BMWs are chosen for their speed and Range Rovers for their size.