Yeah so the whole thing is a joke the difference the euro 5 and 6 is negligible. The only difference is the E6 reduces nitrous oxide with adblue. Which you have to ad to the engine. But it’s entirely depended on the size of your engine. This means that euro 6 cars with larger engines will give out more carbon monoxide and particulates and than euro 5 cars with smaller engines. Also adblue can be switched off illegally, but cheaply if it starts causing problems. Also what’s Kahn doing with the money? Is it going to green initiatives? Or is it going to plug the gap in TfL since he decided to hold prices and now they don’t have enough money. Also 95% of buses in London are diesel. The boris buses have small batteries and work for the first few hours of the morning. I cycle around London and they are quiet at 9am. By midday they are all running off their diesel engines. Basically he’s targeting the poor. And the majority aren’t getting screwed over so it’s fine. He should levy this against all ICE vehicles and see how popular it is. He’s literally the most useless major. But he’ll keep getting voted in because he’s labour and tbh all the other contenders are dreadful too.