The next leader of the UK Independence Party will be unveiled later.
Paul Nuttall has been elected leader of the UK Independence Party, replacing Nigel Farage.
Paul Nuttall, Suzanne Evans and John Rees-Evans are all bidding to replace Diane James, who resigned last month, 18 days after her election.
The 39-year-old Member of the European Parliament, who served as UKIP's deputy leader for six years, won 62.6% of support among party members.
Since then, former leader Nigel Farage has been running the party on an interim basis.
He promised to "put the great back into Britain" and force the government to "give us a real Brexit".
The new leader will be tasked with uniting the party, which has been hit by high-level resignations and infighting among key figures.
Mr Nuttall defeated former deputy chairwoman Suzanne Evans and ex-soldier John Rees-Evans.
Ms James resigned from the party altogether earlier this month, saying she had not received any support during her brief spell as leader, while another prominent figure in the party, MEP Steven Woolfe, said UKIP was in a "death spiral" when he quit after a high-profile clash with a colleague in Strasbourg.
It was UKIP's second leadership election this year, previous winner Diane James having quit after 18 days in the role. Mr Farage acted as interim leader while the second leadership race took place.
All of the candidates have promised to unite the party and have pledged to reform its internal structures.
In his acceptance speech, Mr Nuttall said: "The country needs a strong UKIP more than ever before.
Mr Nuttall, UKIP's former chairman, has said he will bring the party back from "the edge of a political cliff".
"For if UKIP is to be an electoral force, there will be an impetus on Theresa May and her government to give us a real Brexit."
Previous UKIP leaders
UKIP has been plagued by disputes between senior figures over the summer, with some leaving the party.
Diane James (September-October 2016): UKIP's first female leader only lasted 18 days in the job, saying she lacked authority. The MEP later quit the party
But Mr Nuttal said, under his leadership: "There will be one theme - unity - because only unity breeds success."
Nigel Farage (2006-2009 and 2010-2016): The face of UKIP for more than a decade, he served two stints as leader, during which UKIP became a major force in British politics. He quit briefly in 2009 and again in 2015 but soon after changed his mind.
Mr Nuttall took 9,622 votes. Ms Evans came second with 2,973 votes (19.3%) and Mr Rees-Evans third with 2,775 votes (18.1%).
Lord Pearson (2009-2010): The former Conservative peer was elected leader in late 2009 but the party underperformed at the 2010 election and he quit soon after, saying he was not "much good" at party politics.
There were 32,757 ballot papers sent out, with 15,405 votes cast.
Roger Knapman (2002-2006): A former Conservative MP, he joined UKIP after the 1997 election and became leader in 2002. Stood unsuccessfully for Parliament in 2001 before becoming an MEP in 2004. Stood down in 2006.
Mr Nuttall said his first act as leader was to appoint MEP Peter Whittle as his deputy.
Jeffrey Titford: (2000-2002): A popular figure who led UKIP into the 2001 election and served as an MEP for a decade.
Michael Holmes (1997-1999): Served as leader for two years and was elected to the European Parliament before quitting after an internal power struggle in 1999. Subsequently left the party.
Craig McKinlay (1997): Served as interim leader for a few months in 1997, latterly serving as deputy. Contested three general elections as a UKIP candidate before defecting to the Tories and winning the Thanet South seat in 2015 - beating Nigel Farage
Alan Sked (1993-1997): Formed the Anti-Federalist league, which later morphed into UKIP. The academic and former Liberal Party election candidate has since been critical of UKIP, describing it as "Frankenstein's monster".
Ms Evans, a former deputy chairwoman, has said she will make it less "toxic" and aim to occupy the "common sense centre" ground.
Mr Rees-Evans, a former soldier, has promised to energise the party by opening decision-making up to its members.
On the eve of the leadership announcement, Mr Farage - who has been linked with a possible move into the House of Lords - told the Sunday Express he "can't do anything" because of threats to his security.
"Certainly I would not go out in London of an evening on my own without security - couldn't even think about it," he said.
"I can't even walk down the street without it. I have to go to private places, private venues.
"The thought of doing a Friday night pub crawl around Westminster - I just can't do it any more."
