Jeremy Corbyn's successor as Labour leader will be announced tomorrow. Sir Keir Starmer, Lisa Nandy and Rebecca Long-Bailey remain in the running for the top job. And in the deputy race, it is Angela Rayner, Dawn Butler, Ian Murray, Dr Rosena Allin-Khan and Richard Burgon. But how have we got to this point? Here is a look at the process which will determine who becomes the next leader of the opposition.

FIRSTLY, the candidates had to win the backing of at least 22 MPs or MEPs apiece to make it into the second round. Then they had two routes to pursue.

They could either win nominations from five per cent of Constituency Labour Parties (CLPs), made up of party members in constituencies, with each meeting to decide which candidate to back.

Or they had to get the support of three affiliated socialist organisations, including two affiliated unions such as the GMB, Aslef or Unite.

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These groups had to be large enough to represent at least five per cent of affiliated members.

Each candidate had to receive the required support from CLPs or affiliates by February 14 to make it onto the ballot paper.

Shadow foreign secretary Emily Thornberry was narrowly eliminated from the race at this point, securing two short of the 33 local constituency party nominations she required and failing to receive any nominations from Labour Party affiliates.

On February 21 the ballot opened, with voting papers sent out to party members, members of affiliated trades unions and groups and 14,700 "registered supporters" who paid £25 to take part on a one-off basis.

Voting worked using a preferential system, with members ranking the candidates in order of preference.

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

The same rules applied for the deputy leadership contest.

Voters had until midday on Thursday, April 2, to make their voices heard, with the results counted ahead of Saturday's victory announcement.

But due to the coronavirus, the winner of the race between Sir Keir Starmer, Rebecca Long-Bailey and Lisa Nandy will no longer be unveiled at a "special conference" as planned.

Instead, Jeremy Corbyn's successor as Labour leader and their deputy will now be announced at a scaled-back event with candidates having pre-recorded victory speeches.

The winners will assume their roles immediately, leaving Mr Corbyn to return to the backbenches unless the winner wants him in their shadow cabinet.

Who are the contenders?

Rebecca Long-Bailey

South Wales Argus:

Rebecca Long-Bailey speaking at the Labour leadership hustings on the stage at SEC in Glasgow on February 15, 2020 in Glasgow, Scotland. Picture: Robert Perry/Getty Images

The shadow business secretary is highly rated by the outgoing Labour leadership, leading to claims that she would be the "continuity candidate" keeping the Corbynite flame alive.

Out of the three remaining candidates, she has called most firmly for Labour to stick with the party's left-wing direction, especially when it comes to nationalising public industries.

The 40-year-old was backed by senior figures in the party after announcing her decision to run, including securing the support of chairman Ian Lavery, shadow chancellor John McDonnell and shadow education secretary Angela Rayner, her friend and flatmate.

The Salford and Eccles MP has repeatedly highlighted her childhood experience, growing up in the shadow of Manchester United's Old Trafford stadium and watching her father worry about job losses as a docker and trade union representative.

Pitching the concept of "aspirational socialism" to members, she said the party needed to better explain how Labour's left-wing policies could help workers and families to get on in life.

The fan of open selections for MPs also pushed the idea of a "green industrial revolution" to bring about new jobs in the renewables sector and vowed to abolish the House of Lords and replace it with an "elected Senate" based outside of London.

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Lisa Nandy

South Wales Argus:

Labour leadership candidate Lisa Nandy. Picture: Stefan Rousseau/PA Wire

The only candidate in the final run-off not to be in the shadow cabinet, the Wigan MP comes from political stock, with her maternal grandfather having been a Liberal MP while her father, Dipak Nandy, is a Marxist racial equalities campaigner.

Before her election in 2010, Ms Nandy worked for the youth homelessness charity Centrepoint and The Children's Society.

The former shadow climate change minister has been critical of the handling of the anti-Semitism crisis that has blighted the party in recent years, accusing her rivals of not doing enough to speak out while serving in Mr Corbyn's top team.

Having founded the Centre For Towns think tank, the 40-year-old has also been outspoken about the need to win back Labour's former industrial heartlands where voters switched in their droves to the Conservatives at the last election.

During the campaign, she has impressed commentators with her handling of big interviews, faring well in one-on-ones with the BBC's Andrew Neil and slapping down ITV's Good Morning Britain presenter Piers Morgan after his remarks about Meghan Markle and racism.

She has pledged stronger powers and more money for town halls and argued for better bus services, an issue where she said cutbacks had particularly hit the country's towns.

Sir Keir Starmer

South Wales Argus:

Labour leadership candidate Sir Keir Starmer speaking during the Labour leadership hustings at the SEC centre, Glasgow. Picture: Jane Barlow/PA Wire

The shadow Brexit secretary and former director of public prosecutions is the bookies' favourite to win the leadership, despite being viewed as more of a centrist than his main rival, Ms Long-Bailey.

But his campaign has seen him play up his left-wing credentials, highlighting his work as a lawyer supporting trade unions and poll tax protesters, and he has said the party should not "oversteer" to the right in the wake of the election defeat.

He has been the MP for Holborn and St Pancras since 2015 and was instrumental in getting the party to back a second Brexit referendum - although he acknowledged that the scale of the election defeat meant the issue was now settled.

However, he has refused to rule out campaigning for Britain to return to the European Union in the long term.

His policy pledges include raising income tax for the top five per cent of earners, campaigning for EU freedom of movement to continue and to push for "common ownership" of public services such as mail, rail and energy.

The 57-year-old, who lost his mother-in-law during the leadership race, has also vowed to introduce a prevention of military intervention act if he becomes PM to ensure Britain could only go to war if the Commons agreed.