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Neither. It's all just a load of spintastic bollocks, as is evident from this sentence from the press release:
"The Mayor of London today launched a new public consultation on the next phase of his hard-hitting plans to tackle London's toxic air, reduce filthy emissions and protect the public from harmful pollution by expanding the Ultra-Low Emission Zone (ULEZ)."
Good PR, fuck all practical benefit. Double win.
https://tfl.gov.uk/info-for/media/press-releases/2017/november/gla---mayor-launches-ulez-expansion-consultati
You’re right, there’s no mention of resident grace period any more, so 2021 is most likely.
From my basic survey of cars on the road, I really don’t see it making much difference. The majority of private cars are already low emissions because they’re relatively new, taxing older cars will barely make a dent. On one hand they’re trying to say it’s such a big problem that they need to reduce it to reduce pollution but then in the same breath they’re trying to say not that many residents will be affected. Which is it?