London mayor Sadiq Khan is considering a huge expansion of the city’s low emission zone or pay-as-you-drive road charging.

The policy options revealed today are part of a push to cut car journeys in London by 27% to help the city reach net zero carbon emissions by 2030.

Khan said his mission was to “nudge” drivers away from all petrol and diesel cars and into either electric vehicles, public transport, walking or cycling.

The current ultra-low emission zone, or Ulez, was already expanded in October from a small core of inner London to cover a 380 sq km area within the north and south circular roads.

One proposal would extend this to the whole of Greater London, which is more than four times the size.