Ed Miliband stood down as leader in the face of a "very disappointing and difficult" election night. With brother David Miliband all but ruling himself out it falls to the likes of; Yvette Cooper, Andy Burnham and Liz Kendall to fight it out for the chance to lead and rebuild the party.
Nick Clegg took the Liberal Democrats to Downing Street by way of the coalition, but following unkept promises and a poor showing in the election he stood aside. With few standing MPs this may be the closest fought of all the party leadership battles.
Having lead the Conservatives to a surprise majority in the 2015 election David Cameron appears safe as leader. But with Borris Johnson, Theresa May and George Osborne wanting their chance at the keys to No. 10, there is no guarantee he will make it to the next general election.