differant police forces use different vehicles. Here in South Yorks we've still got our Pug 307's, pug dispatches, new focuses, various volvo's some land rovers, hi-lux etc... there is a force somewhere that's got a few L200's and a new nissan nevara.
The micra in the pic looks like a sponsered car, i.e. a firm will 'sponser' a police car, usually policy dictates that a sponsered car won't be used for B&T work so it'll spend the bulk of it's time on enquiries, going around in safer neighbourhood teams etc...