They stress there was a “cohort of people who refuse to pay multiple PCNs” in a major blow. 

They warn that a “significant amount of debt” remains outstanding where money could be funnelled into "improving the transport network”.

Alex Williams, TfL's Chief Customer and Strategy Officer stressed around 96 percent of vehicles driving inside the ULEZ zone are now compliant. 

However, he stressed those issued penalties for breaking the rules could quickly see their punishment escalated if they continued to ignore notices. 

He explained: “We want to send a clear message to vehicle owners that if you receive a penalty charge for driving in the zone, you should not ignore it. 

“Your penalty will progress to enforcement agents to recover the fines that you owe, and there is a risk that your vehicle and other items of property will be removed.

"The aim of the ULEZ is to clean up London's air and remove old polluting cars from the road so no drivers need to pay and no fines occur. 

“There is only a small minority of drivers who are eligible for the charge, and even fewer who are refusing to pay - but we encourage anyone experiencing financial difficulties not to ignore PCNs, and to engage with our staff, who will work with you towards a resolution, including setting up debt payment plans."

TfL warned that bailiffs can visit addresses to recover money owed if a registered keeper ignores a warrant. 

Data from TfL confirmed that a whopping 1,429 cats were seized and removed from the road between August 2023 and July 2024.

Meanwhile, a staggering 761 seized cars were auctioned which recovered an eye-watering £710,147 in revenue.