If you're just joining us, in a few minutes' time we will be getting the results of Labour's leader and deputy leader contests.

What's the system for how party members, trade unionists, and supporters have chosen the winners?

The ballot, which closed on Friday, was a preferential system, with voters ranking the candidates in order of preference.

If one candidate gets more than half the first preference votes, then they win - but if not, it gets a bit more complicated.

In this case, the second preference votes of the lowest-ranked candidate will be redistributed...until the contest produces a winner.

Vicki Young
Chief Political Correspondent

After an extremely bad loss at the last general election, it has been a very long contest over three months for the candidates.

But the backdrop has changed due to the nature of the current crisis with coronavirus.

Today's special conference and the unveiling of the new leader? None of that is happening.

And with prerecorded victory messages from the candidates, the winner will make contact and lay out something, but it is not what was expected.

The real question for whoever wins is the massive challenge the Labour Party faces after four election defeats in a row, and how to plot a path back to victory.

Of course, the political landscape has changed and economic policy thrown up in air, as huge amounts of public money is pumped into every sector.

But it is very interesting that Boris Johnson has chosen today - the day Jeremy Corbyn steps down - to write to all leaders of opposition parties, asking them to work together with him to tackle the crisis.

It will be interesting to see the new leader's approach - whether it be one of a critical friend or something else.

Image source, Thinkstock

Labour members have been voting for their new leader and deputy since late February via post and email. The ballot closed on Thursday.

Among those eligible to cast their votes were 114,000 new members who joined since the election.

Members of affiliated trades unions and other affiliated groups were also able to take part, as well as about 14,700 "registered supporters" who paid £25 to take part on a one-off basis.

Both the leader and deputy leadership ballots use a preferential system, with members ranking the candidates in order of who they favour.

If one candidate fails to get more than half the first preference votes, the second preference votes of the lowest-ranked candidate will be redistributed until the contest produced a winner.

And we will find out the details of how these votes panned out at 10:45 BST.

Image source, PA Media

One of the big issues the next Labour leader will be facing is tackling allegations of anti-Semitism in the party.

The row has plagued its members and MPs for over three years - you can read our guide to how it played out here.

And the party is still under investigation by the Equality and Human Rights Commission.

This week, the Board of Deputies of Deputies of British Jews called for the winner of the contest to resolve all outstanding cases within four months.

Board President Marie van der Zyl, said she wanted to have a "strong working relationship with the new leadership".

But in an article in The Times, external, she said she needed to see "words [transformed] into actions" on tackling the issue.

Read more here.

As Jeremy Corbyn bids farewell, a rare interview surfaced with his wife.

Former human rights lawyer Laura Alvarez has stayed out of the spotlight during her husband's tenure.

But in a parting shot, she used an interview in the Daily Mirror to accuse the media of having "vilified" Mr Corbyn and claimed he was "attacked by his own party" during his time in charge.

You can read more from the interview here.

If you were with us earlier, you'll have seen that there's already been much discussion over the extent to which the new Labour leader should work with the government over the coronavirus crisis.

Now, less than an hour before the result is announced, Boris Johnson has called on opposition leaders to "work together" with the government at "this moment of national emergency".

In an open letter posted on Twitter, external, the prime minster has invited opposition figures to a briefing in Parliament with him and the government's top scientific advisers next week.

"I want to listen to your views and update you on the measures taken so far," he says, pledging to "engage constructively" with other parties.

Image source, Getty Images

Labour had been planning to hold a special conference today, with tensions building through the morning, the big announcement and the crescendo of the new leader's speech.

But, of course, the coronavirus outbreak put an end to that tradition, and it will be a little different today.

The result is going to be sent to journalists over email and put on the party's website at 10:45 BST.

Even stranger for the candidates - they were asked to record their victory speeches ahead of the result, so the winner's could be published at the same time.

A little different, yes, but in these unprecedented times, we will do our best to create the build up you were hoping for...

Today Programme
BBC Radio 4

James Schneider, who in 2015 co-founded the Momentum group that has supported Rebecca Long-Bailey in this contest, says they “won’t act as wreckers” if Sir Keir Starmer wins.

"What Momentum will do is try to play a constructive role," he adds.

Mr Schneider, a former director of communications for Jeremy Corbyn, also advises that the next leader should be "constructive" with the government on the coronavirus issue, but not give ministers a "free ride".

He argues groups such as renters and the self-employed have been “left out from the government response" and the new leader would do well to focus on helping them.

Image source, PA Media

Don't forget, as well as a new leader, we will get a new deputy leader of the Labour Party.

The last incumbent was Tom Watson, who stood down in December both as an MP and second in command before the general election result even came in.

The front runner throughout the race has been shadow education secretary Angela Rayner, and most expect her to seal the deal later this morning.

But, as our political correspondent Helen Catt says, nothing is ever certain in politics.

The other contenders for the job are shadow equalities minister Dawn Butler, Scotland's only remaining Labour MP Ian Murray, Tooting MP Rosena Allin-Khan and shadow justice secretary Richard Burgon.

Helen Catt
Political correspondent

This is a big moment for a party, but the new Labour leader is taking over in unprecedented circumstances.

When the race began in January, the candidates would have been aware of the political challenges they would face, having just suffered a big election defeat and having seen lots of highly publicised tensions in the part over issues like anti-Semitism.

But Sir Keir Starmer, Rebecca Long-Bailey and Lisa Nandy couldn't have foreseen they would be taking over amidst a global pandemic where the normal political rules just don't apply.

Whoever wins, their first job will be to set out how to approach the coronavirus outbreak, and it is going to be really important how the new leader holds the government to account.

But who will win? Sir Keir led in the previous rounds and is seen as the front runner, while Long-Bailey's campaign - seen as the natural heir to Jeremy Corbyn - never seemed to take off.

But nothing in politics is ever certain.

In less than two hours, Labour will have a new leader.

But remember, before the new leader is installed, you have to bid farewell to their predecessor.

Jeremy Corbyn is stepping down after five years in the job, with quite a list of memories to take with him.

Watch our video summing up his leadership in just two minutes.

Today Programme
BBC Radio 4

Now of course, one of the first decisions the new Labour leader will have to make will be over the party’s role throughout the ongoing coronavirus crisis.

Former Labour MP Jenny Chapman, who has been chairing Sir Keir Starmer’s campaign, says he would want to “play his part” in helping the country navigate the crisis if he wins today.

But she adds he would also want to challenge the government “responsibly” where “necessary and appropriate”.

“I don’t think the nation is in the mood for political knockabout on this or point-scoring, what they want to see is outcomes improving,” she adds.

Asked whether he should take up the offer to come “inside the tent” if it is made by ministers, for example by attending emergency meetings, she says that would be up to him but she says there is “some sense in that”.

It started with six people in the race, but we are now down to the final three contenders for the next leader of the Labour party.

Click on the links below to read a full profile of each one:

• Sir Keir Starmer
• Rebecca Long-Bailey
• Lisa Nandy

Welcome to the BBC Politics live page, covering all the updates from this final day of Labour leadership contest.

The event announcing the new leader has been cancelled due to the coronavirus outbreak - but it's an ideal day to stay indoors and find out who the new leader of the Labour Party is!

The result is due at around 10:45 BST, but there is sure to be lots of news and views in the meantime.

Not long to go...