I understand why the hon. Gentleman raises that point, but no vehicles would currently be caught by the amendment. It is a question of finding the most effective means by which to do this. As I have said, last December DEFRA published the Government’s plans to achieve these aims and I accept that further work needs to be done, but we have set out a realistic and achievable target, and by 2020 the most polluting diesel vehicles will be discouraged from entering a number of cities.
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