They say a week is a long time in politics, but in the new, post-Brexit world, it is an eternity. In the space of less than 24 hours, between Wednesday night and Thursday morning, all expectations about who will lead this country through arguably its biggest crisis since the Second World War were turned upside down, sending shockwaves that will continue to spread across the political firmament for years to come.

As late as 7.45pm on Wednesday night, Michael Gove’s office was still sending emails to MPs supportive of Boris Johnson’s leadership bid, inviting them to the former London mayor’s launch event the following morning. By midday on Thursday, Mr Johnson was out of the race, torpedoed by Mr Gove’s shock decision to run. On the evening before, Mr Johnson had attended a reception for Conservative MPs at the M&C Saatchi building in Soho.

There was already some disquiet in the room about the way the frontrunner was going about his leadership bid. Monday’s Daily Telegraph column, in which Mr Johnson appeared to retreat on some of the promises of the Leave campaign, had caused misgivings among the right wing of the party. Many MPs had also been put out by the loose manner in which Mr Johnson had gone about drumming up support across the party. Fifty MPs and ministers, most of them in the Remain camp, had been due to hear his pitch that morning, only to be told with 15 minutes’ notice that he was cancelling.

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Meanwhile, jobs and promotion were being dangled in front of wavering supporters, but with no concrete assurances. In short, a certain arrogance and looseness of grip was putting a lot of people off. But as they gossiped over drinks, Johnson’s supporters remained confident. At 8pm, an announcement was due to come in that they hoped would dispel all concerns. Andrea Leadsom, one of the most admired champions of the Leave camp and a prospective leadership candidate herself, was expected to be confirmed, via Twitter, to be backing Mr Johnson.

8pm came and went. The announcement didn’t come. MPs began refreshing their Twitter feeds on their mobile phones with increasing urgency. It never came. Ms Leadsom would go on to confirm her own leadership bid. But the news that she was not backing Boris resonated with Mr Gove and his closest allies, who had already found Mr Johnson a difficult man to deal with since the Brexit vote last week.

It was only after urgent talks late on Wednesday night, with a handful of key allies including human rights minster Dominic Raab, that Mr Gove made the fateful decision not to back Boris, and to run himself. Since the Brexit vote, he had been egged on by his team, by fellow MPs, and, in a now infamous email, by his wife, to stand up to Mr Johnson.

On Monday Rupert Murdoch, an admirer of Mr Gove, tipped him as the “most principled and most able candidate”. As it became clear on Wednesday night that Ms Leadsom was not backing Mr Johnson, Mr Gove’s team began to put calls in to trusted allies who were backing the Johnson/Gove ticket. The message was clear: ‘Michael should go for it’. By midnight, his mind was made up.

In the morning, calls were made to Lynton Crosby, the election mastermind who had been set to back the Johnson campaign. Mr Gove’s team say he tried to call Mr Johnson but couldn’t get through, although this has been disputed by the Johnson camp.

Whatever the truth, at 9.02am on Thursday morning an explosive email from Mr Gove’s team landed in the inboxes of the Westminster press pack. “I have come, reluctantly, to the conclusion that Boris cannot provide the leadership or build the team for the task ahead…I have, therefore, decided to put my name forward for the leadership.”

Boris Johnson had been due to launch his campaign in the luxury surroundings of Westminster’s St Ermin’s Hotel, at 11.30am. So it was that, as leadership rival Theresa May was launching her own bid in a well-received Whitehall press conference, Mr Johnson was grappling with a stark choice between carrying on despite Mr Gove’s bombshell, or dropping out of the race.

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According to some sources, his team were already concerned about the number of MPs firmly signed up to back him. Inevitably, he would now haemorrhage many supporters to the Gove campaign. Only Boris Johnson knows for certain what tipped him over the edge, but it seems clear that he made the calculation that he could no longer win it.

With press and supporters gathered at St Ermin’s, he embarked, 11 minutes late, on the speech that could become his political epitaph. The clues were there when he made a strange reference to Shakespeare’s Julius Caesar, reflecting on the need not to fight against the tide of history “but to take the tide at the flood and sail on to fortune”. The line is taken, not quite word for word, from a speech by Brutus, the friend turned assassin of Caesar.

But the final reveal still had the power to shock. For a politician who made his name as the court jester, only to strive for the crown, Boris teed himself with a fitting phrase. After setting out what would have been his manifesto for leadership, he said: “That is the agenda for the next Prime Minister of this country.

Shape Created with Sketch. The favourites in the Tory leadership race Show all 5 left Created with Sketch. right Created with Sketch. Shape Created with Sketch. The favourites in the Tory leadership race 1/5 Theresa May The longest-serving Home Secretary in 100 years took a back seat in the referendum campaign. While backing Remain, she did not hit the campaign trail and delivered only a handful of speeches and interviews, and was critical of many aspects of the EU, particularly the European Convention on Human Rights. Hedging her bets allows her to now emerge as a ‘unity’ candidate, and she is said to have been building up her back-room staff in preparation for a leadership bid. She has the significant advantage of having served in one of the great offices of state, in a steady and competent manner that has won her many admirers within party and the civil service. At a time of great instability, it may be that she is viewed as steady hand on the tiller. Mrs May does however, lack the ‘star quality’ of a Boris Johnson and party members may doubt her ability to connect with ordinary voters PA 2/5 Michael Gove The Justice Secretary may be able to set himself up as ‘the thinking Tory’s Brexit candidate’. Made an enormous political and personal decision to back Leave, taking on his old friend David Cameron. He performed well during the TV debates, and will be an admired figure among Eurosceptic Conservatives. Along with Johnson, he will be hindered by the fact that he led a very divisive campaign, characterised by ‘blue-on-blue’ action. MPs may also judge that he lacks Boris Johnson’s wider appeal with the electorate. Possibly more likely that he will settle for being his new bosom buddy Boris’s Chancellor Getty 3/5 Stephen Crabb Highly-rated Work and Pensions Secretary, raised on a council estate, so could reach out to non-traditional working class Tory voters Getty Images 4/5 Andrea Leadsom Minister of State for Energy at the Department of Energy and Climate Change is one of the most prominent figures in the Leave campaign, seen to have performed well in TV debates Rex Features 5/5 Liam Fox British Conservative MP and former Secretary of State for Defence, as sources said he will stand for the leadership of the Conservative Party AFP/Getty 1/5 Theresa May The longest-serving Home Secretary in 100 years took a back seat in the referendum campaign. While backing Remain, she did not hit the campaign trail and delivered only a handful of speeches and interviews, and was critical of many aspects of the EU, particularly the European Convention on Human Rights. Hedging her bets allows her to now emerge as a ‘unity’ candidate, and she is said to have been building up her back-room staff in preparation for a leadership bid. She has the significant advantage of having served in one of the great offices of state, in a steady and competent manner that has won her many admirers within party and the civil service. At a time of great instability, it may be that she is viewed as steady hand on the tiller. Mrs May does however, lack the ‘star quality’ of a Boris Johnson and party members may doubt her ability to connect with ordinary voters PA 2/5 Michael Gove The Justice Secretary may be able to set himself up as ‘the thinking Tory’s Brexit candidate’. Made an enormous political and personal decision to back Leave, taking on his old friend David Cameron. He performed well during the TV debates, and will be an admired figure among Eurosceptic Conservatives. Along with Johnson, he will be hindered by the fact that he led a very divisive campaign, characterised by ‘blue-on-blue’ action. MPs may also judge that he lacks Boris Johnson’s wider appeal with the electorate. Possibly more likely that he will settle for being his new bosom buddy Boris’s Chancellor Getty 3/5 Stephen Crabb Highly-rated Work and Pensions Secretary, raised on a council estate, so could reach out to non-traditional working class Tory voters Getty Images 4/5 Andrea Leadsom Minister of State for Energy at the Department of Energy and Climate Change is one of the most prominent figures in the Leave campaign, seen to have performed well in TV debates Rex Features 5/5 Liam Fox British Conservative MP and former Secretary of State for Defence, as sources said he will stand for the leadership of the Conservative Party AFP/Getty

“But I have to tell you my friends, you who have waited faithfully for the punchline of this speech, that having consulted colleagues and in lieu of the circumstances in Parliament I have concluded that person cannot be me.”

The clown of Westminster had delivered his final punchline. As he departed the stage, behind him lay the wreckage of his party’s unity, his country’s economy and the hopes and dreams of the architects of the European Union. Like a restaurant after a visit by the Bullingdon boys: a mess for someone else to tidy up.