Ministers and MPs are heading to Uxbridge and South Ruislip, the place Mr Johnson stop as MP, to attempt to cease Labour seizing it by over-turning a Tory majority of greater than 7,000.

They are already highlighting the controversial extension of the Mayor’s extremely low emission zone to outer London boroughs.

Tory Party chairman Greg Hands, campaigning within the constituency, argued that the ulez enlargement was “very, very unpopular around here”.

He added: “This is a great opportunity to send a message to Mayor Khan that Ulez is not welcome here.”

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Another Tory supply stated: “This will be a referendum on Sadiq Khan’s Ulez.”

Senior Conservatives consider that if they will maintain onto Uxbridge and South Ruislip, it could pile strain on Sir Keir Starmer to intervene to pressure Mr Khan to cut back his enlargement of Ulez resulting from come into pressure on the finish of August.

However, Labour’s candidate in Uxbridge Danny Beales stated: “Local people don’t view this as a binary issue.

“People are concerned about air quality and pollution and their children developing asthma and getting ill, but people are also concerned, in this cost of living crisis, about having to pay an extra charge to drive.”

He added: “The Conservatives may want to run a single issue campaign here, but I don’t think that will wash with voters. The Conservatives tanked the economy and people here have seen their mortgages rise sharply....And where is the new Hillingdon Hospital that was promised? “

But Mr Hands said the Tories would also be campaigning on other “great issues,” with Health Secretary Steve Barclay, having “recently committed to a rebuilt Hillingdon Hospital”.

The Conservatives are at the moment within the course of of choosing their candidate for the by-election.

Several city halls are looking for to dam the Ulez extension by way of courtroom motion.

Shadow well being secretary Wes Streeting, MP for Ilford North, talking on LBC Radio, stated he backed the Mayor’s transfer to deal with poisonous air within the capital and welcomed a “more generous scrappage scheme” introduced for motorists pressured to alter their car because of the wider Ulez zone.

The Government was anticipated to maneuver writs on Wednesday, or probably later this week, to set off by-elections in July within the west London seat and within the North Yorkshire constituency of Selby and Ainsty after considered one of Mr Johnson’s shut allies Nigel Adams MP additionally resigned.

The Conservatives poured activitists into the Mid Bedfordshire constituency over the weekend, the place they're defending a 24,664 majority, after the sitting MP Nadine Dorries additionally introduced that she was quitting.

But as of early Wednesday morning, she had but to formally resign, sparking hypothesis that she might keep on to trigger extra chaos for Rishi Sunak.

An extended delay would imply that the Prime Minister might not be capable of maintain all three by-elections on the identical day, which could have restricted the political fall-out if the Tories lose two or three of them.

Conservative peer and pollster Lord Robert Hayward advised The Standard: ““All three of these by-elections are in play.

“All parties will treat them as very serious contests.”

He added: “In a difficult set of circumstances, he (the PM) has been trying to show that he is in charge of the Government and will therefore want the best possible results in each of the constituencies.

“There is no question that these are important for Keir as well because he has to be able to show that the Labour Party is making progress across the country.”

Lord Hayward confused that within the short-run, Mr Sunak is confronted with a “difficult combination of events” after the shock resignation of Mr Johnson on Friday.

But he believes that the ex-PM’s departure, and of his allies, might within the long-run flip into Mr Sunak’s “advantage”, partly because it weakens his help in Parliament.

Holding onto Uxbridge and South Ruislip, the place the Tory majority in 2019 was 7,210, might show tougher than in Selby and Ainsty, the place the bulk was 20,137.

But the Conservatives have a historical past of by-election successes within the west London seat, with Mr Johnson’s predecessor John Randall, now a peer, profitable there in 1997 shortly after Tony Blair’s landslide victory.

His predecessor Sir Michael Shersby was additionally elected at a by-election in 1972.

Demographic modifications within the constituency, although, might make it more durable for the Tories to win this time.

The Tory majority in Mid-Beds was 24,664 in 2019.

However, the Liberal Democrats, who're focusing on the seat, gained the Tiverton and Honiton by-election final June, overturning a Conservative majority of greater than 24,000

Mr Johnson formally stop on Monday below the traditional custom of taking the Chiltern Three Hundreds.

“The Chancellor of the Exchequer has this day appointed Alexander Boris de Pfeffel Johnson to be Steward and Bailiff of the Three Hundreds of Chiltern,” the Treasury introduced.

Mr Adams was made Steward and Bailiff of the Manor of Northstead.

The “Steward and Bailiffs of the Chiltern Hundreds and of the Manor of Northstead” have been positions historically paid for by the Crown.

In fashionable occasions they're unpaid, formal titles which might be utilized for when an MP must disqualify themselves from the Commons.

An elected MP has no proper to resign, defined Commons officers, so except they die or are expelled they need to turn out to be disqualified in the event that they want to retire earlier than the top of a Parliament.

By regulation, taking up considered one of these titles instantly bars an individual from being an MP.