Two of the candidates to succeed Jeremy Corbyn as the next Labour leader are launching their campaigns.
Speaking in Manchester, Rebecca Long-Bailey will promise to end the “gentlemen’s club of politics” by devolving powers to regions.
And Emily Thornberry has highlighted her experience challenging Boris Johnson, in a speech in her home town of Guildford in Surrey.
The first Labour hustings event will take place in Liverpool on Saturday.
Mrs Long-Bailey and Ms Thornberry will be joined at the debate by fellow candidates Lisa Nandy, Jess Phillips and Sir Keir Starmer.
Labour members will also be able to put questions to the contenders to become Labour’s deputy leader – Rosena Allin-Khan, Dawn Butler, Richard Burgon, Ian Murray and Angela Rayner.
It comes as a YouGov poll of 1,005 Labour members for The Times suggests Sir Keir has extended his lead over Mrs Long-Bailey.
Launching her campaign, near the Bellfields estate where she grew up, Ms Thornberry warned that Labour faces “a long, tough road back to power after the painful and crushing defeat we suffered last month” in the general election.
“We’re going to need someone tough, someone resilient, someone experienced and battle-hardened,” the shadow foreign secretary said.
Ms Thornberry, who scraped through the first stage of the race, securing the required amount of support from MPs minutes before the deadline, said she had the “skills and the values” to be leader and emphasised her experience in the shadow cabinet.
She drew attention to her role “on the front line in the fights against climate change, universal credit, and anti-abortion laws in Northern Ireland”.
Ms Thornberry also said that if she ever lost the confidence of colleagues or thought she was going to lose an election she would stand down.
“I will always put the Labour Party first,” the MP for Islington South and Finsbury said.
The latest YouGov poll showed that Ms Thornberry would go out in the first round of voting with just 3%, with Ms Nandy knocked out in the second round and Ms Phillips in the third, with most of her second preference votes going to Sir Keir.
Reacting to the poll, Ms Thornberry said it would be a “long campaign” and that it would be “short-sighted” to stop now.
She said she had “never taken the easy way” and that “people can work out who is the best leader at the hustings”.
The poll indicates Sir Keir would beat Mrs Long-Bailey in the final round by 63% to 37%, once the other candidates have been eliminated.
A YouGov poll last month suggested the shadow Brexit secretary was on 61%, compared with Mrs Long-Bailey on 39%.
The poll suggests Angela Rayner is on course to win the deputy leadership election in the first round with 57%.
It is a poll of full Labour members only, and does not include registered and affiliated Labour supporters, who are also entitled to cast a ballot.
Meanwhile, Mrs Long-Bailey received a boost on Thursday when she secured the support of the grassroots organisation Momentum.
The shadow business secretary will set out her leadership pitch later and will say the British state needs “a seismic shock, to prise it open at all levels to the people”.
“Where I grew up, Westminster, even London, felt like a million miles away,” she will say.
“The story of the last few years is that many people feel there is something wrong with their laws being drafted hundreds of miles away by a distant and largely unaccountable bureaucratic elite in Brussels.
“But I’ll be honest, Westminster didn’t feel much closer, and it still doesn’t today.”
Mrs Long-Bailey will vow to move power from London to local levels and from chief executives to workers.
Asked whether he was a member of the “gentlemen’s club of politics” that Mrs Long-Bailey will pledge to end, Sir Keir said he had “never been a member of a gentlemen’s club” and was “determined to deliver change for millions of people in this country that desperately need it”.
The shadow Brexit secretary was also asked about rumours he was the inspiration for the character of Mark Darcy in the Bridget Jones books. “I honestly don’t know the answer,” he replied.
Mrs Long-Bailey recently said she was opposed to abortion after 24 weeks on the grounds of disability, adding that this was a personal view rather than a policy position.
Her spokesman said she “unequivocally supports a woman’s right to choose”.
Meanwhile, speaking on the BBC’s Political Thinking with Nick Robinson podcast, Ms Nandy said she was a “sceptic” about the monarchy.
She went on to say she believed patriotism was “a profoundly left-wing value… it is about being part of something bigger than yourself”.
Labour has announced it received 14,700 applications to register as supporters of the party during a 48-hour window.
Registered supporters will be eligible to vote in the leadership and deputy leadership elections.
The figure is well below the 180,000 who registered in 2016 and the 112,000 who did so in 2015.
BBC political correspondent Iain Watson said this could be bad news for Ms Phillips.
He added: “Her whole pitch was to get people to sign up, at least temporarily, if they were disillusioned with the Corbyn era so they could change Labour’s direction. But so far not many have taken up that offer.”