Now here’s an unexpected political development …

Motorists who buy environmentally unfriendly “gas guzzling” cars would be hit by a new batch of green “supertaxes” that would add thousands of pounds to the final bill under plans announced by David Cameron’s advisers.

In a triple assault on high-emission vehicles, they have proposed a new “showroom tax” that would add 10 per cent to the cost of the biggest polluters, a new variable rate of VAT with the lowest charge for the greenest cars, and a new top band of vehicle excise duty that would add up to £200 to the annual cost of licensing “super polluters”.

The proposed taxes would act as an incentive for motorists to drive smaller, more environmentally friendly cars

As a result, a car costing £30,000 that was ranked in the most environmentally damaging category would have £3,000 added in tax to the ordinary cost as well as paying full VAT of 17.5 per cent and additional road tax…

Hmm…. Will this idea make it into the next Tory election manifesto?