Veteran left-wing MP Jeremy Corbyn has been elected leader of the Labour Party.
The 66-year-old took almost 60% of more than 400,000 votes cast during the three-month campaign.
Mr Corbyn, who began the contest as a rank outsider, saw off a challenge from frontbenchers Andy Burnham, Yvette Cooper and Liz Kendall.
In a result which marks a fundamental change of direction for the party, the Islington North MP defeated rivals Andy Burnham, Yvette Cooper and Liz Kendall in the first round of counting, taking 251,417 (59.5%) of the 422,664 votes cast.
His victory was meet with loud cheers by supporters at the QEII conference centre in Westminister, who began the day by singing the left-wing anthem The Red Flag
In an acceptance speech to cheering supporters at Westminster, he called repeatedly for “unity” and announced his ambition to lead a Labour “fightback”, declaring: “We don’t have to be unequal, it doesn’t have to be unfair, poverty isn’t inevitable, things can and they will change.”
Predecessor Ed Miliband offered the new leader his support and called on others in the party to do the same, but made clear he will remain on the backbenches.
Mr Corbyn faced an exodus of senior figures from the party’s front bench team within minutes of being elected. Senior figures including shadow chancellor Chris Leslie, shadow education secretary Tristram Hunt and Ms Kendall have said they will not serve under him.
Mr Corbyn must also prepare to face David Cameron in the House of Commons for his first Prime Minister’s Questions on Wednesday.
Many of those who voted in the Labour leadership campaign had signed up at the last minute for £3, with a turnout of 76%.