Has a leadership challenge been triggered?

No - and the timing of any possible challenge is still unclear.

Will the prime minister stand?

Party leaders are automatically on the ballot paper unless they resign. Earlier, Keir Starmer said he "will stand" in any contest.

Who are the possible contenders?

Much of the talk has focused on Andy Burnham and former Health Secretary Wes Streeting.

Angela Rayner is favoured by some on the left of the party, while former armed forces minister Al Carns has hinted he could also enter a leadership race.

Public finances could be sticking point for any leader's planspublished at 15:26 BST

15:26 BST

Dharshini David
Deputy economics editor

Official figures show that the government borrowed £23.3bn in May to bridge the gap between tax and spending, £5bn more than the previous year.

That’s as higher inflation earlier in the year bumped up some interest payments (some of those are linked to that inflation rate).

It’s only one set of figures but it means that, two months into the financial year, borrowing is running above the official target.

Burnham has indicated he’ll stick to current rules on borrowing if he becomes prime minister - but markets still assume his plans would include more spending than at present, and possibly, higher taxes.

The chief of the Confederation of British Industry (CBI), one of the UK's biggest business groups, has warned that the country "cannot afford a summer of speculation and drift" as talk grows about a possible leadership challenge.

CBI chief executive Rain Newton-Smith says on social media that political uncertainty "dampens business confidence and investment".

"For strong, stable economic growth you need strong, stable, consistent government," she says.

Meanwhile, British Retail Consortium (BRC) chief executive Helen Dickinson tells the BBC it's important for any possible leadership contenders to "stay focused on what matters to retailers and consumers alike - keeping prices affordable and supporting investment and job creation".

Throughout the day, we've been hearing your thoughts on the results of the Makerfield by-election and what this means for Prime Minister Keir Starmer.

John says the result in Makerfield was less about support for Burnham and more about wanting to get Starmer out.

Margaret says: "Fantastic result for Andy Burnham. A Reform win doesn't bear thinking about."

Alan says this is an important moment for the UK's future and it's time Starmer put the country before himself. He calls for Starmer to resign and give a new Labour administration a chance to tackle the country's problems.

Anne says people just wanted to vote Starmer out - but the irony is Burnham isn't exactly who they want either, and they may vote differently in a general election. She adds that Makerfield voted for the sake of the country at this time.

What do you make of the result? Let us know.

Joe McFadden
Reporting from Ashton-in-Makerfield

Anne, who lives in the Makerfield constituency and voted in this by-election, says she likes Andy Burnham but hopes he keeps his word.

"I think there is a lot of frustration coming through," Anne says, adding that this is due to "false promises" people have been given in the past.

"I know it's difficult to keep a promise sometimes, but we’ve been let down in a lot of ways."

Anne says there’s a lot of poverty in Wigan and that there needs to be more opportunities and jobs for younger people.

"I've had my time, you know, I'm still working, but I just hope for the younger ones, there's change."

Liz Roberts
Reporting from Ashton-in-Makerfield

Arthur Ratcliffe was getting his hair cut in Ashton-in-Makerfield when he shared his thoughts on the by-election results.

From the barber's chair, he says: "I voted Reform. I’ve picked the wrong one again haven’t I?"

He says he likes Reform UK's policies and that "they want the country back".

After Burnham's big win - which saw him secure almost 9,000 more votes than Reform's candidate Robert Kenyon - Ratcliffe says he thought Reform "would have done a lot better".

Despite not backing the winning candidate, he says he thinks Burnham is "alright": "He’s one of us. He’s got the gift of the gab."

Reform still ahead nationally in recent pollspublished at 14:30 BST

14:30 BST

By Daniel Wainwright

While Andy Burnham has won for Labour in Makerfield, Reform UK has been leading national opinion polls for more than a year.

Reform has an average of around 27% support in polls conducted in the two weeks up to 18 June, which is down from its peak last autumn but still ahead of everyone else.

Labour is currently vying with the Conservatives for second place, with both parties on an average of about 19%.

The Greens and the Liberal Democrats are on an average of 13% and 12% respectively.

The SNP are on 3% and Plaid Cymru are on 1% with their vote share measured across the whole of Great Britain, but they only stand in Scotland and Wales respectively.

While Restore Britain came third in Makerfield, we don’t have an average of their support as only a few polling companies currently produce a figure for them. For example, YouGov, external’s latest poll has Restore on about 4% and Survation’s latest , externalsuggests around 2% of people would back them, while some pollsters place them in categories such as "Other".

All figures are what’s known as "headline" voting intention which is where pollsters have either removed or adjusted for people who were undecided or didn’t intend to vote.

Jack Grey
Live reporter

Image source, Reuters | Getty Images

Andy Burnham has won the Makerfield by-election for Labour with 55% of the vote, opening the door to a possible challenge to Prime Minister Keir Starmer.

What has Burnham said

• In his victory speech, Burnham said Labour’s win could be the “turning point” for politics in the UK, telling the Labour Party that “this is a final chance to change”
• He later told supporters he plans to set out a "new path for Britain", but did not announce any plans to launch a leadership bid

Starmer's reaction

• Starmer congratulated Burnham, writing that voters chose “hope and optimism over division and hate”
• Speaking to reporters, the prime minister said a leadership contest would "plunge the country into chaos" - but added he would stand if one was triggered

... and from our correspondents

• The prime minister woke this morning to an imminent threat to his position following Burnham's decisive victory, writes BBC chief political correspondent Henry Zeffman
• The sheer size of Burnham's win adds weight to the argument of his supporters that he is the only Labour figure who can beat Reform UK, according to BBC political correspondent Alex Forsyth
• Our political editor Chris Mason suggests a lively few weeks are in store after Burnham's emphatic win leaves Starmer and Labour with a big decision to make

While the Makerfield by-election has dominated headlines, constituents in two areas in Scotland also headed to the polls yesterday to vote for their own MPs.

As Andy Burnham won in Makerfield, the Conservatives celebrated a result that pushed the SNP into second in Aberdeen South, although the latter held on to their seat in Arbroath and Broughty Ferry with a large margin.

Here are some snapshots from across the vote counts.

Image source, PA Media

Image source, Reuters

Image source, PA Media

Image source, PA Media

Image source, PA Media

Image source, PA Media

Today marks a "really significant moment in British politics", according to the chief executive of polling firm Ipsos in the UK and Ireland.

Kelly Beaver tells Radio 4's World at One that while Keir Starmer's leadership has been under pressure for some time, there is now a "clear alternative" for MPs to support in Parliament.

Asked if the by-election result could translate into a national vote, Beaver says there were some circumstances that made Makerfield unique, such as it being in Andy Burnham's home region.

But she says there are elements that would give Labour MPs hope for a general election.

Beaver says Burnham polls particularly well for being clear on what he stands for, being likeable and in touch with ordinary people - areas where Starmer has struggled.

However, she adds that leadership is only one factor in a general election, with people also deciding based on the party and the issues of the day.

Image source, Reuters

Keir Starmer has reiterated today that he is "not going to walk away" from his role as prime minister.

However, if this changed, he could choose to stay in post during a transition period before handing over to a successor, who would be both Labour leader and prime minister.

If Starmer chose to resign with immediate effect, a member of the cabinet would replace him in a caretaker capacity.

This would involve a decision by the cabinet, which would consult with Labour's National Executive Committee. Deputy Prime Minister David Lammy would not necessarily fill the caretaker role.

A leadership contest would then follow.

In this scenario, each potential challenger would need support from 20% of the party's MPs and to be backed by either 5% of constituency Labour parties, or at least three affiliated organisations - of which two must be affiliated trade unions.

Image source, PA Media

Wes Streeting has the support to stand in a potential leadership race if he needs to, says Labour MP Melanie Ward.

She resigned from government to support Streeting’s bid to become Labour leader after he resigned as health secretary.

Ward adds that she thinks all the key Labour players need to speak to each other this weekend so that an orderly transition can take place.

Speaking to Vicki Young on Politics Live, she says: "In the life of any captain of a team … there comes a time when the captain has to hand over the armband - a time when the captain has lost the dressing room."

Ward also says Streeting is "prepared to speak to the other key players and work out a different way through this".

• You can catch up with today’s Politics Live on BBC iPlayer.

Can the PM make it to a contest without losing ministers' confidence?published at 13:10 BST

13:10 BST

Henry Zeffman
Chief political correspondent

Image source, EPA/ PA Media

Two of the most common words I have heard from Labour MPs this morning: "deluded" and "coronation".

Deluded: that is how some Labour MPs, across different party factions, are describing the prime minister’s apparent belief that he can fight on. Starmer’s view, and that of his allies, is that those who believe that Labour can change leader within two years of a general election without meeting the same fate as the Conservatives are the truly deluded ones.

Coronation: the term increasingly being used to describe the leadership election which is now inevitable. In other words, MPs are saying they do not believe there will be a full contest which gets to the stage of a ballot of Labour members, but that instead Burnham would end up being the only candidate and therefore elected by acclamation, as Gordon Brown was in 2007.

One complicating factor in any coronation could be Wes Streeting, who quit as health secretary in protest at Starmer’s leadership last month.

Some MPs are pretty sceptical that he has the support of 81 MPs required to trigger a contest.

We may find out within days, but he is likely to come under real pressure including from some of his allies, to fold in behind Burnham to enable a swift transition.

Of course the bigger complicating factor is Starmer, who says he would be a candidate and automatically has a place on the ballot of party members as the incumbent. In that sense his path to the leadership election is straightforward – he doesn’t need the backing of any of his MPs, let alone 81.

Yet in our system the prime minister can only be the prime minister if he commands the confidence of a majority of MPs.

Can Starmer make it to a leadership election without losing his ministers’ confidence in a messy, public manner? That is the big question of the next few days.

Nick Eardley
Political correspondent, in Ashton-in-Makerfield

Andy Burnham's team and supporters have been singing Oasis songs in the club house after his victory rally in Ashton-in-Makerfield.

We could hear them singing the Manchester band's hit Half the World Away from outside.

I’m told Burnham was leading the singing.

More from Starmer's call to Labour staffers now - read our last post for the first instalment.

He emphasises the need "to take the fight to Reform" and "maintain that Labour mayoralty" in Greater Manchester - where a contest has been triggered to replace Andy Burnham as he heads to Westminster.

“This is the fight in politics at the moment. We should relish the opportunity to take the fight to Reform and give them a hiding in Manchester, and frankly, expose them for who they are: divisive, inward, wanting to divide our country, the complete opposite values to us," he says.

Starmer claims Reform only seeks to "exploit" problems, pull communities apart and set people against each other.

“That is the complete opposite of us in the Labour Party, who believe in our communities, who believe that by coming together we get the best out of everyone. We are the true patriots, they are plastic patriots," he adds.

Image source, Pool/Getty Images

Keir Starmer is thanking Labour staff across the country for their work on the Makerfield by-election.

In a call, the prime minister calls on Labour to "pull together as a party and a movement" following Burnham's by-election win.

"The one thing we've got to avoid doing is plunging our party and our country into chaos by turning on each other and tearing apart our party and our movement," he says.

Starmer adds that this is what the last government did under the Conservatives, and "we need to learn that lesson".

The Makerfield by-election has further inflamed speculation around a potential Labour leadership contest.

While no official challenge has been launched, there have been rumours for a long time now around possible contenders.

Former Health Secretary Wes Streeting, newly elected MP Andy Burnham and former Deputy Prime Minister Angela Rayner are considered the main potential challengers to Keir Starmer.

Rayner is favoured by some on the left of the party. She delivered a speech in March in which she said Labour was "running out of time".

Burnham's win inthe Makerfield by-election has set him up for a route to launch a challenge. Speaking this morning, he stressed a need for change across the UK and pledged to lay out a "new path for Britain".

Streeting resigned as health secretary following the local election results, telling Starmer he had "lost confidence" in him. He has confirmed he would enter any potential contest and previously told BBC Newsnight he would be "prepared" to trigger one.

Here's BBC Radio 5 Live's Matt Chorley on how a contest would work:

Image source, PA Media

Chris Ward, a minister in Keir Starmer’s government, has told Vicki Young on Politics Live there shouldn’t be a leadership election.

He says the PM "has a mandate from the party to be leader, and from the country to lead the country.

"That’s the mandate he’s been delivering for the last two years. And he’s going to step up delivering in the coming months as we move into the next phase of the government."

• Keep up to date with the latest reaction to today's result on Politics Live on BBC iPlayer.

No 10 has just reiterated Starmer's earlier remarks that there currently is no leadership challenge and that he intends to stand should there be one.

Asked whether any ministerial resignations should be expected today, an official spokesman says: "The prime minister is very much getting on with the business of delivering his government’s agenda - the agenda that stabilised the economy, that’s invested in public services and brought down waiting lists."

Liz Roberts
Reporting from Ashton-in-Makerfield

We've been hearing from people in Makerfield, following Andy Burnham's big win there last night.

Tony Thakur says he would traditionally vote for the Tories, but at the ballot box yesterday he picked Andy Burnham.

"I was looking at the country and thinking, do we need a change? yes. I think Andy Burnham is the best option for that," he tells me.

Thakur warns that Burnham has a "big job on his hands", adding: "I think it’s good news for now but we have some turmoil ahead."

Gemma Crinigan says "the result didn’t surprise me" as "people turned out in their droves to vote for Andy".

The results back that up, as the former Greater Manchester mayor took 55% of the vote.

Crinigan tells me: "I think we’re voting for his style of politics. We’re voting for what we’ve had in Manchester. We want people to feel better."

Meanwhile, Keith Crossland tells me: "I’ve always been Labour, but voted Reform this time. I thought it was time for a change and give someone else a chance."

On Burnham's win for Labour, Crossland says he hopes the newly-elected MP "does what he’s promised and does something for us, not just down in London".