Who could be the next Labour leader?
Jeremy Corbyn lasted just under a year before his leadership of the Labour Party was challenged.
Following the EU referendum, where Labour campaiged to Remain despite Mr Corbyn's previous Eurosceptic views, he faced a mass exodus from his own Shadow Cabinet.
By mid-afternoon on June 27, 2016, 23 of the 31 shadow cabinet members had resigned, along with seven parliamentary private secretaries.
Following a vote of no confidence from the Parliamentary Labour Party (PLP), and challenges from Owen Smith and Angela Eagle (who later withdrew and endorsed Mr Smith), the Labour Party had a leadership contest for the second time in two years.
Mr Corbyn was re-elected as Labour leader with 313,209 votes (61.8%) compared to 193,229 (38.2%) for Owen Smith – an increased share of the vote from his election the year previous.
Five months later, there is already talk of the Leader of the Opposition stepping down, although his mandate increased in his second leadership election.
But who could replace Jeremy Corbyn?
The newly-appointed Shadow Business Secretary was heralded by Shadow Chancellor John McDonnell as the "next generation of our socialist leadership team emerging", following her appearance on BBC's Question Time.
Ms Long-Bailey is one of the newer MPs, being elected for Salford and Eccles in 2015. After nominating Mr Corbyn for the leadership, she replaced Hilary Benn on Labour's NEC. In June 2016, she was appointed Shadow Chief Secretary to the Treasury.
The former solicitor was viewed more favourably in the so-called secret poll leaked to the Sunday Times, being described as “passionate”, “genuine”, “sincere” and “very smart”. The only negatives were being "aggressive" and "rough".
Another of the new intake in 2015, Angela Rayner increased the Labour majority in her constituency, Ashton-under-Lyne in Greater Manchester.
She has served as Shadow Minister for Pensions and Shadow Minister for Women and Equalities, before she was appointed Shadow Education Secretary in July 2016.
Ms Rayner received less of a positive reaction from the poll conducted in Manchester, where she was judged as “not likeable”, a “bit charity shop-looking” and “weird”.
The Guardian asks: where have all the centrists gone? Tristram Hunt has given up his Stoke seat for the directorship at the Victoria and Albert Museum in London, and Corbyn critic Jamie Reed resigned his seat in Copeland for a job in the nuclear industry.
Following Ed Miliband's resignation after the General Election in 2015, it was speculated that Dan Jarvis would run for leader. However, he decided against it as he wanted to put his family first. The Barnsley MP had recently re-married after losing his first wife to cancer.
He has warned that the Labour Party faced "annihilation" under Jeremy Corbyn, and supported Owen Smith in the 2016 Labour leadership contest.
Seen as the rising star of the left of the party, Clive Lewis resigned from the Shadow Cabinet over the Brexit bill.
The former Shadow Business Secretary, replaced by Ms Long-Bailey, quit after voting against triggering Article 50 - challenging Jeremy Corbyn's three-line whip.
Although he was one of the 2015 intake, he has already served as shadow defence secretary and shadow business secretary.
The Norwich South MP has dismissed talk about challenging Mr Corbyn's leadership, calling claims "total bollocks".
He became one of four shadow cabinet members to resign over the vote, after his constituency voted strongly to remain in the EU.