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LONDON - AUGUST 04: A 2008/ 2009 car tax disc is on display in a car windscreen on August 4, 2008 in London, England. Some MPs believe plans for new increased car tax rates on high fuel consumption vehicles should be made bolder to ensure a more effective impact on the environment. (Photo by Cate Gillon/Getty Images)

LONDON - AUGUST 04:  A 2008/ 2009 car tax disc is on display in a car windscreen on August 4, 2008 in London, England. Some MPs believe plans for new increased car tax rates on high fuel consumption vehicles should be made bolder to ensure a more effective impact on the environment.  (Photo by Cate Gillon/Getty Images)