With all the talk about scrapping old diesels - what exactly is considered an 'old' diesel?

There's a lot of talk in the press of scrapping old diesel cars. What constitutes old? Can we put dates or is it defined by emissions?

Asked on 11 April 2017 by Nick Blezard

Answered by Honest John
Pre-EU4 which came in from January 2006, but many 2005 cars were EU4 in preparation for EU4.
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