Lots of people missing the point in my opinon. Yes, it is called a congestion charge, but if it was true to it's name then hybrid / electric cars would not be exempt because they also cause congestion! So, what is it? Congestion reducing? Pollution reducing? It needs to be the latter. Focus needs to be on reducing pollution. So, the tax should encourage purchase of low emission cars. What's worse? Lots of low or zero emission cars on the roads of london or lots of pollution? I think there should be a charge for driving doopers into london but in the region of £4 per day. Most of the money should go on improving trains and buses.
I'm in agreement that the Dooper should pay congestion charge. The whole point of the congestion charge was to reduce the amount of vehicles going through the specified zones and increase the use in public transport wasn't it?
Then exempting low-emission cars like the dooper etc from it doesn't really make sense, they may reduce pollution but still can cause congestion. Even electric cars should have to pay (if they don't already, I don't know) as they're on the roads.
I sometimes wonder if the people in power think before opening their mouths