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LEZ is being upgraded to euro6 from next year, this is entirely separate to the ULEZ requirements which are also being implemented at the same time.
Daily charge for any commercial vehicle will start at £100 per day and is in operation 24hrs a day.
Edit. This suggests that this is not going to be implemented until October 2020. I am fairly sure that yesterday I read implantation has been brought forward to coincide with the ULEZ, I will check Monday.
https://tfl.gov.uk/modes/driving/low-emission-zone/about-the-lez
Not sure that's actually true, it seems to be a mix of the ULEZ starting next march which would affect this van but only in central London vs the LEZ which currently only affects vehicles registered before 2002. If the LEZ is rolling then next year this vehicle might be liable for a charge but it wouldn't be related to EURO 6.
At least as a van owner who lives in London that's the information I've been looking at.