The "ULEZ penalising the poor" argument is nonsense, really.
All petrol cars manufactured since 2005 (and presumably some earlier) are ULEZ compliant, meeting the Euro 4 standard.
Anyone who can't afford to buy and run an 18 year old car can't really afford a car.
Well, there may be some different circumstances involved: https://www.lbc.co.uk/news/wimbledon-school-crash-driver-seizure-bit-tongue/
(This is from The Sun's "a source", so may need to be taken with salt)