Jeremy Corbyn has been elected as the new leader of the Labuor Party by a landslide.
The Islington North MP defeated rivals Andy Burnham, Yvette Cooper and Liz Kendall in the first round of counting, taking 251,417 - 59.5 per cent of the 422,664 votes cast.
His victory was cheered loudly by supporters at the QEII conference centre in Westminster, who had greeted him to the event by singing the Red Flag.
The 66-year-old won only a handful of votes from his fellow MPs but was swept to victory in the race to replace Ed Miliband, the Doncaster North MP who stepped down as leader following the general election, by a surge of enthusiasm from members in the country as well as new "registered supporters" who paid £3 to secure a vote.
Mr Corbyn must also prepare to face David Cameron in the House of Commons for his first Prime Minister's Questions on Wednesday.
His supporters chanted 'Jez we did' as he took to the stage, putting on his glasses to deliver his acceptance speech.
Mr Corbyn said the campaign 'showed our party and our movement, passionate, democratic, diverse, united and absolutely determined in our quest for a decent and better society that is possible for all.'
Last month hundreds of people attended a rally to hear Mr Corbyn speak in Sheffield.
People cheered when Mr Corbyn said his policies were based around hope, unity and optimism - and he urged locals to give their ideas and help shape future policy.
He said he would challenge austerity and believed cuts to local authorities, including Sheffield’s, were wrong.
He also spoke of his commitment to protecting the NHS as a free service and his belief that education should be free for all.