Theresa May is soon expected to accept her time has run out and confirm plans for her departure from Number 10.
When she does, a series of wheels will start turning, kicking into action the process of deciding the new leader of the Conservative Party – and the new Prime Minister.
It’ll mean another leadership contest – which could take as long as six weeks.
And the timeline will awkwardly coincide with Donald Trump’s state visit to the UK.
Here’s how the next few days, weeks and months are likely to play out.
Theresa May meets Tory power broker Sir Graham Brady, chairman of the party’s 1922 Committee of backbenchers, in Westminster this morning. He will demand, and she is set to give, a timetable for her departure. Mrs May is expected to make a TV statement in Downing Street setting out exactly when she will go.
The Prime Minister will be in her Berkshire constituency with husband Philip preparing for her last days in office. Leadership candidates battling to succeed Mrs May will appear in the weekend papers, setting out their stalls for their campaigns.
Parliament is in recess so Mrs May will be spared her weekly Commons ordeal of Prime Minister’s Questions.
Monday, June 3
Donald Trump arrives for a three-day state visit where he is due to spend time with the lame-duck PM.
Wednesday, June 5
The PM and other leaders, including the US President, are in Portsmouth for ceremonies marking the 75th anniversary of Operation Neptune, the D-Day sailings.
Thursday, June 6
Mrs May joins leaders in Normandy for commemorations, marking 75 years since the Allied invasion.
Monday, June 10
The date is pencilled in for when the PM is expected to formally resign as Conservative leader, firing the starting gun on a race to succeed her. In reality, it has been underway for weeks already.
Tory MPs vote in the various stages of the leadership election, until just two candidates remain.
Mrs May, as now a caretaker PM biding time until her successor is elected, attends an EU Council summit in Brussels.
Hustings between the final pair are held across the country as the Tories’ 120,000 members decide who should become the new party boss – and PM. It is unclear how long the contest will last, but many senior Conservatives want a new leader in place before the summer recess.
Conservative Party conference kicks off in Manchester, where the new leader is expected to get a rousing reception.
UK is due to leave the EU without a deal unless Parliament can pass a withdrawal agreement.