Has any1 seen the probs in germany at the mo? they are scrapping decent cars with 40.000 on the clock!! scrapys arnt allowed to sell the cars on and engine an cog boxes no1 wants. hows that good for the environment??
I think the environment bit is more of a tag-line to please more voters - I wouldn't get too wound up about that side of the coin. The primary objective is a financial stimulus for the car industry, which has the nice side-effect of having a global benefit due to the international nature of all car firms, plus car firms are some of the biggest employers on the planet, helping to get the money back into consumers pockets - it will help kick-start the world y'all!!
As a huge percentage of car purchases (even with £2k from the Gov) will be bought via credit of some form, the banks benefit too. Its employment, money markets and an industry bail-out in one nice easy to swallow pill.
As everyone's already said, I doubt many people will actually take up the offer, but then they don't want it to be too popular, just enough to boost trade a little.