[extraduder_ire]

I think the implication is that wherever you have your car, it's worth less because it costs money to drive it in london, which directly affects its resale value. Pretty indirect though.

[tpm]

Sure, but that also applies only to pre-Euro 6 diesel cars, so pretty old anyway.

[robertlagrant]

7 years old. Basically it's a tax on people who don't have a new diesel. And on businesses who require vehicles to get goods in.