Candidates are arriving for the debate at the BBC's New Broadcasting House, which starts in under an hour.

Rory Stewart stopped for interviews on his way in to the central London studios.

Image source, Reuters

An hour ago we learned that five of the six leadership hopefuls had made it through to the next round. Dominic Raab - perhaps the hardest Brexiteer, on the face of it at least - was eliminated.

Boris Johnson, Michael Gove, Sajid Javid, Jeremy Hunt and Rory Stewart all go through and will take part in the BBC leadership debate that begins at 20:00 BST.

It'll be the first such event for Mr Johnson, the frontrunner, because he refused to take part in Channel 4's TV debate on Sunday.

The official Twitter account of the Sajid Javid campaign has posted a video of their candidate to the stirring soundtrack of the Avengers movies.

BBC News Channel

Guy Opperman, who is a supporter of Michael Gove, says his man has "slowly but surely clawed his way back into the contest" after damaging headlines last week about drugs.

He says he expects a "significant number" of the MPs who have so far voted for Dominic Raab to come his way, as Mr Gove is a "committed Brexiteer".

"I think Michael is a proven debater, I expect him to do very well tonight," he adds.

BBC Radio 5 Live

Mo Hussein, former special adviser to cabinet minister Amber Rudd, says candidates appearing in tonight's leadership debate need to "connect" with the audience.

"A lot of things can get lost in Westminster-speak or heavy policy-speak," he tells BBC Radio 5 Live.

"Ultimately people will be looking for leadership and people who can make them feel something."

BBC Radio 5 Live

Image source, Getty Images

Conservative MP Richard Graham, who is backing Jeremy Hunt, says descriptions of Mr Hunt as a "low energy" opponent to Boris Johnson are "a wonderful bit of disinformation".

He tells BBC Radio 5 Live: "Jeremy Hunt is really best placed to take on Boris."

However, Mr Graham says he doesn't think Mr Hunt will pick up "that many" more votes from Dominic Raab being knocked out of the contest.

"I think it'll be more important to see what happens to Sajid Javid, his bid, and perhaps later to Rory Stewart's," he says.

BBC News Channel

Simon Hoare, who is supporting Sajid Javid, says he is "delighted" and "very proud" that his man has made it through into the next round.

He says the home secretary will be staying in the race, even though he only made it by the skin of his teeth with 33 votes.

Mr Hoare adds that Mr Javid's team is "in it to win it” and it would be good for the Tory "brand" if he made it into the final run-off.

Meanwhile, Gillian Keegan, who is backing Rory Stewart, says his increased support in the second ballot - where he added 18 votes - is because “more people have seen him”.

She adds that his plan for Brexit is the "most realistic" of all the candidates, and he has a “star quality” rarely seen in the worlds of politics or business.

From questions on Brexit to the NHS, we asked people what they would ask during tonight's debate. Watch what they had to say.

What is prorogation? Well, at the end of every parliamentary session Parliament is "prorogued" by the Queen. It essentially closes Parliament and ends the process of current legislation until a new session begins. Although it is technically at the Queen's "command", in practice it is the government's decision.

It had been suggested that a new prime minister, concerned about MPs blocking the UK's exit from the EU, could advise the Queen to prorogue Parliament, therefore sending MPs away so they can't do anything to scupper Brexit.

Dominic Raab's refusal to rule out such a move was not popular with some of fellow candidates for the top job.

BBC News Channel

Johnny Mercer, who is supporting frontrunner Boris Johnson, says he is "quite a long way in front", but cautions: "This is not done yet."

Questioned whether his man can be unifying figure, Mr Mercer says he thinks he can, adding: "It's clear to me that the country wants Boris Johnson."

He adds that his election as Tory leader would be a chance to get on with the "One Nation stuff that people like me have been banging on about".

Five candidates are left in the Conservative leadership contest after Dominic Raab is eliminated in Tuesday's vote.