After days of speculation, Keir Starmer has announced his resignation as Labour leader and PM.

It comes after Andy Burnham's victory in last week's Makerfield by-election and he is on his way to Westminster to be sworn in.

Here are some of Monday's key moments:

Image source, Reuters

Image source, Reuters

Image source, Reuters

Image source, Reuters

As Starmer has announced he is standing down as Labour leader, a process will begin to appoint his successor.

There may or may not be a contest, depending on how many candidates put their name forward.

Here are the key dates to keep in mind:

Jamie Moughton
Reporting from the 10:55 Manchester to London train

Andy Burnham is currently on a train, heading towards London Euston, ahead of his swearing in as an MP later today.

We're in the carriage next to Burnham, who declined to speak to us about his leadership bid announcement, giving the same response to other reporters we saw try.

He's accompanied by a team of around half a dozen staff, and appears to have a security detail with him too.

Image source, Reuters

James Cook
Scotland editor

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Supporters of Scottish independence say Sir Keir Starmer's resignation boosts their case.

In the decade since the UK voted to leave the European Union (against the wishes of a majority of Scottish voters) the nation has had six prime ministers.

There are now nationalist first ministers in Edinburgh, Belfast and Cardiff. Coincidence? Or consequence?

Scottish nationalists say they don't believe that a seventh PM in 10 years will be able to repair what they characterise as "Broken Brexit Britain" – a nation of entrenched low growth, poor productivity and high inequality.

Where, they ask, is the stability and prosperity promised by those who successfully campaigned in favour of the union in 2014?

"This is no way to govern. Scotland deserves better," says first minister and Scottish National Party leader, John Swinney.

But supporters of Scotland remaining in the UK insist independence would add chaos to instability.

They want the focus to be on improving governance and are highly critical of the SNP’s stewardship of public services.

The Scottish Labour leader, Anas Sarwar, called for the prime minister to resign before last month's Holyrood elections — the implication being that management in London and Edinburgh was the problem, rather than the constitution.

Responding to Starmer's resignation, Sarwar has thanked Starmer for his leadership and the 2024 general election win - adding: "The Labour Party must quickly return its focus to the purpose it was elected for – to deliver the change people need."

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Cabinet ministers have continued to react to the news of Keir Starmer's resignation as prime minister.

Foreign Secretary Yvette Cooper says Starmer has "decisively restored Britain’s credibility" and praised him for Labour's 2024 general election win after "one of our worst defeats in history in 2019".

Culture Secretary Lisa Nandy says she is "grateful to him and his family for the sacrifices they have made... they deserve all our thanks".

Newly appointed Health Secretary James Murray thanked Starmer for "everything you have done for the country and our party".

Welsh Secretary Jo Stevens describes Starmer as a man of "dignity, duty and commitment to our country" and says he has transformed the Labour Party and "rebuilt public trust".

Business Secretary Peter Kyle writes in a statement: "Keir earned my respect when I saw him fight to save Labour. He earned even more of it as prime minister, restoring Britain’s place in the world."

Steve Rosenberg
Russia editor

Image source, Reuters

The Kremlin won’t be sorry to see Keir Starmer leave Downing Street.

"Keir Starmer hasn’t distinguished himself at all in terms of Russia-UK relations,” President Putin’s spokesman Dmitry Peskov tells me on the daily Kremlin conference call for journalists.

“He was always a supporter of maintaining these relations at the very lowest level...We don’t remember anything noteworthy about him in the job."

But the Russian authorities aren’t expecting much to change, in terms of the relationship between Russia and Britain.

“It’s unlikely that anyone on the British political scene will have a different position to Keir Starmer on our bilateral relations,” Peskov says.

This morning’s edition of the Russian government newspaper, Rossiyskaya Gazeta, describes Andy Burnham as “a consistent critic of Russia, who constantly calls for the West to adopt a tougher stance on Russia".

Ben King
Business reporter

There was a muted reaction on financial markets to Sir Keir Starmer's resignation as prime minister.

The effective interest rate on the benchmark 10-year UK government bond fell around 0.035%, a slightly larger fall than other European bonds.

There was a notable drop in UK bond yields shortly after 11am, as Wes Streeting announced that he was backing Andy Burnham - reducing the likelihood of a long and bruising succession battle.

The FTSE 100 index of leading shares rose about 25 points following Streeting's announcement, to hit 10,388.

The pound is up around 0.5 cents against the dollar since Sir Keir's resignation, though the euro was also up against the dollar - suggesting the move is not entirely in response to UK political news.

Joe Pike
Political correspondent

A spokesperson for Wes Streeting has told the BBC he hasn't done any deal with Andy Burnham.

It's after the former health secretary announced he'll be backing Burnham for the Labour leadership; Streeting had previously suggested he would compete if Stamer's role was challenged.

"There’s no deal", Streeting's team says.

"Wes hasn’t done this because he’s been offered a job. He’s done it because it’s the best way forward for the country."

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Keir Starmer is stepping down as prime minister and Labour leader.

Here is what you need to know this Monday lunchtime:

Emotional speech: At Downing Street this morning, Starmer said that becoming prime minister had been the "proudest moment" of his life, but he accepts with "good grace" that he no longer has his party's backing.

Burnham arrives: Potential successor Andy Burnham, fresh off his win in last week's Makerfield by-election, is due in Westminster today to be sworn in as an MP, clearing the way for him to stand for the leadership. He has already said he intends to stand.

Orderly handover: Starmer will remain in office until Labour selects a new leader, which will happen before parliament returns in September if there is a contest. His weekly audiences with the King will continue while he remains at No 10.

Streeting backs Burnham: Wes Streeting, the former health secretary, says he is backing Burnham for leader. Streeting was seen as another potential candidate, and his stepping aside helps clears the way for Burnham.

Political reaction: Labour MPs are paying tribute to Starmer and his legacy, while Reform's Nigel Farage is calling for a general election. The Conservatives said earlier that's not necessary. The Lib Dems' Ed Davey says the public is "sick" of constantly changing leaders, while Greens leader Zack Polanski says the next PM "must be bold".

Family time: Starmer says he will now focus on being the best husband and dad to his "fantastic wife" and "beautiful children, who are my pride and joy".

Labour's leadership contest is probably over before it has begunpublished at 11:57 BST

11:57 BST

Henry Zeffman
Chief political correspondent

After Wes Streeting’s announcement that he is backing Andy Burnham, it feels this contest is probably over before it has really begun.

It’s possible that a die hard Starmerite will feel obliged to at least temporarily put up a fight against Burnham, but right now it feels unlikely — and even more unlikely that any candidate would get to the magic number of 81 MPs they need to back them to stand.

The crude political reality is that even Labour MPs with misgivings about Burnham are now likely to back him in the hope of getting a job in his government.

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On social media, Conservative leader Kemi Badenoch reacts to Wes Streeting's decision to support Andy Burnham, rather then pursue his own leadership ambitions.

"If you're not running, what are we waiting for?" she asks - seemingly referring to the timetable to replace Keir Starmer.

Earlier, Starmer said he would ask the Labour Party's National Executive Committee that nominations for the new leader open on 9 July.

He said this will be completed "by the summer recess", which is a week later, on 16 July.

In the case of a contest, this will ensure a new leader is in place by the time Parliament returns from its summer break on 1 September, he said.

Image source, Reuters

More senior Labour figures have been sharing messages of support for Keir Starmer in the wake of his resignation.

Home Secretary Shabana Mahmood says: "Keir Starmer led our party from the brink, back to power." His achievement will "never be forgotten", she adds.

"The Labour Party and the country owes a great deal to Keir Starmer," Work and Pensions Secretary Pat McFadden writes on social media.

Meanwhile, Energy Secretary Ed Miliband says Starmer's statement outside Downing Street showed "the great dignity and integrity that is the mark of the man".

And, after applauding Starmer's speech, Chief Secretary to the Prime Minister Darren Jones says he's grateful for his leadership and wishes Starmer's family well "for what comes next".

Gareth Gordon
BBC News NI political correspondent

Where Northern Ireland was concerned, Keir Starmer enjoyed one big advantage denied to his four immediate predecessors: he did not have to spend any time waking Stormont from one of its frequent periods of suspension.

It was already back from its latest enforced period of inactivity - as a result of the Democratic Unionist Party's (DUP) boycott over the Northern Ireland Protocol - by the time he took office and there it remained until his downfall.

It meant no flights to Belfast to knock heads together. Not that many of those Conservative prime ministers - Theresa May, Boris Johnson, Liz Truss and Rishi Sunak - spent a lot of time doing that anyway.

Berating Rishi Sunak at the Labour conference in 2023, the then shadow NI secretary Hilary Benn said: "Where is he? If Keir Starmer was prime minister he'd be there working hard to find a way forward."

Would he? It was never put to the test.

Image source, Downing Street / EPA

Sam Harrison
Reporting from the 10:55 Manchester to London train

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We’re on board the 10:55 service from Manchester to London along with Team Andy Burnham. He arrived amidst a sea of cameras as he walked into the main lobby at Manchester Piccadilly.

He appeared to be in a good mood. When I asked him how he was feeling, he said he’s honoured to represent Makerfield and that that is his focus today.

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Scotland's First Minister John Swinney says Starmer made the "right decision" to resign from office, adding that it was "past time for him to face reality".

"On a personal level, I wish the prime minister and his family well. Leadership is tough, and can make extraordinary demands both on the leader and their families," he adds.

But Swinney - who is the leader of the SNP - urges for a "fundamental change of direction" rather than just a change in personnel.

"Labour’s time in power has been characterised by broken promises, poor judgement and, ultimately, failure," he adds.

Daniela Relph
Senior royal correspondent, reporting from The Mall

As the prime minister remains in post for now, his regular audience with the King will continue as usual with the next one scheduled for later this week.

As we reported earlier, Keir Starmer spoke to the King this morning to tell him he was resigning. They spoke over the phone. The King was at Highgrove - his estate in Gloucestershire.

Deputy PM David Lammy has just briefly spoken to BBC News outside No 10. He says today we've seen "the decency, the goodness of the man" in Starmer's resignation.

"He is a good man, principled, decent. I think we’ve seen in his resignation this morning the character of the man putting the country first," he adds.

Lammy says Starmer's legacy as Labour leader includes "rooting out antisemitism" in the party and lifting it from its election defeat in 2019 to its landslide win in 2024.

As PM, says Lammy, Starmer has stabilised the economy, restored the UK's reputation on the international stage, stood by Ukraine and seen NHS waiting lists fall.

He adds that he has been "very proud" to serve alongside him - and will also be loyal to the next Labour leader.

Image source, Getty Images

Chancellor Rachel Reeves has praised Starmer following his resignation announcement.

She says Starmer took Labour from its "worst defeat in modern history" to a "landslide majority just four years later".

"We have achieved a lot together to be proud of, and there is more to do. I am grateful for Keir's leadership and the work he has done to build a stronger, more secure Britain," she says.

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Here is the full statement from Wes Streeting, in which he says he will back Andy Burnham to become Labour leader:

"Keir Starmer led us to a general election victory that no one thought possible. He kept us out of the war in Iran and has delivered real progress as prime minister at home. He has made the right decision to stand down as the leader of the Labour Party that he saved.

"After a devastating set of election results in May, the Makerfield by-election has proven that Labour can still win if we have the courage to change. It was a victory for unity and hope over division and hatred.

"It was also Andy Burnham’s victory. Andy has shown what Labour can be when we are inclusive, united, and in touch with the lives of the people this Party was founded to represent.

"I left the government because we were losing the fight to nationalists in every corner of the country. I have spent the weeks since speaking to our former councillors, activists and voters in place we lost - to listen and learn from them.

"I've also been setting out ideas to change our country: a plan for Britain to grow again and grow together, with a progressive capitalism focused on wealth creation as much as wealth distribution; to lead the world in the fourth industrial revolution and protect people from its risks; to modernise our public services; to give Britain energy security; to build stronger alliances with democracies around the world and a new special relationship with Europe; and to change the culture of our party so that it is more inclusive and open to ideas.

"Having spoken at length with Andy in recent days, I'm convinced that there is a place for those ideas under his leadership; that he is committed to building an inclusive party that draws on the best of our political traditions; and that he can win the fight of our lives against the forces of nationalism.

"We could spend the summer exaggerating small differences, or we can roll up our sleeves and help him to deliver the change our party and our country needs. That is the choice that I am making and I hope that everyone else will back Andy, too.

"We were elected change our country, to show that politics can be a force for good, and to spread opportunity for everyone. With Andy, we still can."

Former health secretary Wes Streeting has announced he will back Andy Burnham for Labour leader.

Streeting resigned from government in the wake of the May's election results, and said that he has lost confidence in Starmer's leadership.