Ideally you shouldn't buy a diesel car for environmental reasons but if you do decide to, then be aware that the Government will almost certainly use that reason to hammer you with a hefty road tax in the future. Perversely, revenues for the exchequer have already fallen quite significantly because car drivers have switched to lower polluting vehicles, so he has to claw that income back somehow. That’s what is really behind the new road tax changes. It seems it’s quite a complicated picture – see this article:
http://www.autoexpress.co.uk/car-new...ut-uk-road-tax