I just responded to the Mayor's plan to expand the Ultra Low Emission Zone in London. From what I can tell it looks like I will have to pay £12.50 every day to drive my Chimaera. Sounds bad.
The "survey" about the new ULEZ is on TFL's website. I can't say my response was that supportive of their proposals. Worth having a look if you own a car of "more mature" years.