The Conservative Party fights to keep one of its seats in the heart of Uxbridge and South Ruislip on June 20.
A by-election sparked by the resignation of Boris Johnson could see the area fall into Labor hands for the first time this century.
In a Telegraph documentary, Conservative candidate Steve Tuckwell says the seat has become the “western front” against Sadiq Khan’s expansion of the Ultra Low Emissions Zone on the outskirts of London.
He argues that any vote for Labor is a vote to support the expansion of “ULEZ”, and wants to avoid discussion of Johnson’s eight-year term as constituency MP.
Danny Beales, the Labor Party candidate, has pivoted in his support for ULEZ, saying he would fight in Parliament and on City Hall.
Blaise Baquiche, the Liberal Democrat, says the campaign is “personal” and he is willing to challenge the government over “Partygate.”
As the race rages ahead of Thursday’s vote, Downing Street is watching closely. If the Conservatives cannot hold on to Uxbridge, Rishi Sunak will face serious doubts about his leadership.