huh? cars that haven't been ordered don't exist!!!
thats the whole point, if NEW cars are whacked with huge premiums to make them less attractive then a) the arse will fall out of the gas guzzling market b) far fewer of them will end up on the roads c) manufacturers will be forced even more to extract more and more performance out of smaller co2 emmissions to keep sales moving of higher end cars
To me thats win/win, you influence the amount of gas guzzlers on the road and force change with the manufacturers.
Why would a car manufacturer give a toss if your 5yr old mondeo wasn't fuel efficient?
What if you're on a low income and happen to have a more polluting car which was within your budget to buy and run before but a doubling of road tax now take it out of that bracket?
What are you supposed to do? Throw your now worthless car (thanks to it costing a fortune in tax) away and walk? green yes but hardly the sign of a free country.
Rob a bank?
I'm absolutely bought into heavy charges on new cars to influence behaviour but unless calamity brown plans to invent a time machine I fail to see how he can influence behaviour I've already behaved.