“That’s why we need a network of accredited dealers who supply vehicles of the types that will be affected by the Clean Air Zone, from hackney cabs and private hire vehicles to lorries, vans, minibuses, buses and coaches.

“This isn’t a scrappage scheme, and it’s not open to brokers. We’re looking to work with independent, franchised and manufacturer direct dealerships for both new and used vehicles to help make sure that those eligible for financial support from the scheme can easily upgrade to compliant vehicles.

“I’d encourage any dealers who meet our criteria to register their interest now.”