Yes I agree with MatydaLover, Higher taxes on big cars is somewhat pointless. But then they are not bothered about people buying them it is just another source of revenue, this time off the rich.
It is the same with the small change Darling has put on cigarettes and alcohol, with the excuse that it is to curb smoking and consumption of alchol.
This is rubbish people will still smoke and drink. If he was seriously bothered to curb these two activities, he would have made cigarettes �10 for twenty and a similar increase on alchol.