Basically what Phil said but it's only cars made after march 2007 I believe that get hit on the mega tax(above 250 g/km iirc),like range rover v8's etc.

Hadn't realised they've put it up that high now,I know there were a few Korean people carriers etc that were being charged £450 per year due to high emissions,think they were only 2.0l petrols as well!!!

A few that got caught up were landrover freelanders,beetle automatics and even the little sport Ka was something like £250 per year!!