Will your car become worthless after the budget announcement? There are fears that the Chancellor will punish drivers in today's Budget. The Society of Motor Manufacturers and Traders has issued a warning over what it calls the government's "anti-diesel agenda" whilst new changes to road tax laws coming into force in April will also see buyers of smaller, lower emission vehicles paying more. To find out all the potential impacts Juliette Foster spoke to former racing driver and motoring editor at Confused.com Amanda Stretton.