These proposals need to be scrutinised to make sure they really make a difference to London’s environment. We all want to tackle NO2 emissions but most vehicles built after 2005 perform just as poorly as those built before so the cut-off date is meaningless.

Small business owners and ‘white van drivers’ with older company vehicles will effectively be taxed for travelling into the capital to work – that cannot be right. I’m in favour of constructive measures to improve London’s air quality but schemes like this make it harder to undertake strategies that will genuinely lower emissions.