James Cleverly, who has quit the Conservative frontbench to stand as the party's London mayoral candidate, has pledged a "full review" of Sadiq Khan's Ultra Low Emission Zone (ULEZ) policy. He accused the Labour mayor of waging a "vindictive assault on drivers", particularly in outer London, and said he wanted to ease the financial pressure on people who drive for family or business reasons, though he stopped short of promising to scrap the scheme entirely.

ULEZ was introduced by Khan in 2019 and charges non-compliant vehicles £12.50 a day, with the zone controversially expanded to cover all 32 London boroughs three years ago. Cleverly, who is stepping back from frontline politics and will not seek re-election in his Braintree seat, said Conservative leader Kemi Badenoch had been supportive of his decision but would remain neutral in the party's selection process. He also criticised Andy Burnham's devolution plans as an attempt to centralise power in Manchester at London's expense. Khan, currently in an unprecedented third term as mayor, has not said whether he will seek re-election in May 2028.