The Government's bid to raise road tax could be scuppered by rebel MPs who plan to use obscure Parliamentary powers today to stop the move.
They are concerned that drivers who bought cars after 2001 face increases aimed at getting them to buy greener models.
But members of the Environmental Audit Committee will put out a rarely-used "minority report" against the move because they say it a 'new tax on old cars'.
It accuses Gordon Brown and Chancellor Alistair Darling of not thinking through the impact of the £455 charge on struggling motorists.
The rebels, led by Tory MP Graham Stuart, claim the tax is aimed at raising cash for the Treasury.
This country is a bloody joke.. I read in the paper yesterday that there going to fine people for over filling bins ?? WELL GET THE BLOODY COLLECTIONS BACK ON A WEEKLY SCALE THEN YOU WOULDNT HAVE TO GIVE US A STEALTH TAX WOULD YOU MR BROWN???