Another stealth tax, brilliant.
Best way to stop so many people driving unneccesarily would be to actually sort out public transport. Both the cost of it, and the reliability of it. In my area (not London mind, may be different there, sure the amount of buses per hour ir anyways
) there is one bus per hour into town. Half the time its either very late, very early, or doesn't show up at all Fares are 4 quid for the journey. Can get a taxi for half the price if theres 2 of you, so damn sure I would be driving rather than using buses as driving costs much less than taxis so maybe it would be like 2 quid or something if driving myself.
A lot of my friends say they would use public transport if it came on time, often enough to actually get them to work in time rather than you having to be there 2/3 hours earlier to make sure you actually got there..and was not a riiculous price
So if the issue actually was the enviroment rather than just wanting to rob more people, this would be a good start. But its never about that is it...