The London Assembly is calling for the mayor of London, Boris Johnson, to introduce a £2.50 levy on all diesels entering central London from next year.

Stephen Knight, lead Liberal Democrat on the assembly council, is proposing the tax on all diesels entering the congestion charge zone ahead of the introduction of Boris’ planned Ultra Low Emission Zone in September 2020.

The London Assembly has already called for Johnson to pull the introduction of ULEZ forward, but the mayor has refused in order to allow businesses more time to prepare.

The ULEZ will require non-Euro6 diesels and non-Euro4 petrols travelling in the zone to meet the new criteria 24 hours a day, seven days a week, unlike the regular congestion charge zone, which operates between 7am and 6pm Monday to Friday, or pay a daily charge. Non-compliant ULEZ vehicles will still be allowed inside the zone, but will have to pay a daily charge of £12.50 on top of the £11.50 C-charge