A growing coalition of London councils has written to the Mayor of London insisting on more evidence for his ill-conceived ULEZ expansion plans that stand to cause misery and chaos for residents and visitors to the outer boroughs.

The London boroughs of Bexley, Bromley, Harrow and Hillingdon are requesting the Mayor demonstrate the lawfulness of the proposals and the data behind them.

Until they have seen compelling evidence to the contrary, it remains the councils' position that the scheme will not translate successfully to outer London boroughs and that the negative impact to local households and economies will far outweigh the negligible air quality benefits.