The London mayor declined to say whether he is on the same page with Labour leader Sir Keir Starmer, who blamed concerns around Ulez for his party's narrow by-election defeat in Boris Johnson's old Uxbridge and South Ruislip seat last month.Ulez, which costs drivers of vehicles that do not meet minimum emissions standards £12.50 a day to enter, is set to expand to all London boroughs from August 29 in a bid to tackle air pollution.

The London mayor declined to say whether he is on the same page with Labour leader Sir Keir Starmer, who blamed concerns around Ulez for his party's narrow by-election defeat in Boris Johnson's old Uxbridge and South Ruislip seat last month.Ulez, which costs drivers of vehicles that do not meet minimum emissions standards £12.50 a day to enter, is set to expand to all London boroughs from August 29 in a bid to tackle air pollution.