[Neil]

Its ok if you want to help foreign car manufacturers.
Maybe you should only get the subsidy on a new car manufactured in the UK by UK workers.

If they do it the new cars should have to be efficient models in the low CO2 bracket.

Personally I can not see how it is a green thing to do. Scrap a perfectly good old car which will use loads of energy up to recycle then build a new car that will use loads of energy up to make. I wonder how much CO2 is created scrapping a car and making a new one.

Reusing is better than recycling.

Why not give the same subsidy to anyone wanting to convert a car to LPG. That would be a much greener thing to do than scrap and make a new car.