As an exemplar of a good policy badly implemented, the expansion of the ultra-low emission zone (Ulez) in outer London has few rivals.
Sadly, it stands as a case study in political and administrative failure. It is also, equally balefully, another example of where what was once a powerful cross-party consensus on protecting the environment has melted away in the white heat of competitive electoral politics.
As with the latest relaxation of housing planning rules on water purity, and other symbolic downgrading of the green agenda by ministers, it does not bode well for the cleanliness of our home environment – or for the future of the planet.
Join our commenting forum
Join thought-provoking conversations, follow other Independent readers and see their replies