http://www.bbc.co.uk/news/uk-politics-41985715
an interesting longer-read article on the BBC News site about how decisions made back in 2000/2001 by then chancellor G. Broon had the unintended consequences of massively increasing the numbers of diesel cars on the road and therefore urban air pollution. Diesels quickly went from being a real minority of new cars sold to the majority and total numbers on the roads quadrupled from 3 to 12 million.
Some of these papers show that civil servants objected to a stronger policy to deter diesel usage on presentational grounds, because they did not want the government to be seen as "penalising" diesel drivers.
Quite. Why should those responsible for creating more pollution be penalised?
Turns out that when it comes to environmental credentials, neither petrol nor diesel are really with any merit.
I could have told you that...
Anyway, 18 years down the line we are all breathing in the consequences of fat-headed decisions made for the wrong reasons.