Uxbridge

The contest, which took place on July 20, was one of the first parliamentary by-elections in England where voters had to show a form of photo identification.

The Tory safe seat, which was held by former prime minister Boris Johnson, has just seen its 7,000 majority shrunk to only 500.

Senior party figures blamed the expansion of the charge on high-pollution vehicles for the failure to take Boris Johnson’s former seat.