The race now moves onto supporting nominations from constituency Labour parties: who will emerge the strongest?
Jeremy Corbyn has picked up the endorsement of Unison, Labour's second-largest union and seen as the "swing vote" in the Labour party. What's going on?
Jeremy Corbyn has earned the endorsement of the trade union Unison.
A first look at the new issue.
The surprise frontruner for the Labour leadership has been given a boost with the support of 25 campaign groups.
The electoral system, combined with basic arithmetic, dictates that a party in search of power must eschew sectionalism and adopt a big-tent electoral strategy.
Michael Chessum looks back at the Greek climbdown.
The Labour leadership candidate has clarified his positions on our membership of the European Union.
Campaigners are renovating a condemned home in a Barnet estate to show that regeneration doesn't have to mean demolition.
Far from ending its terminal phase, Labour is merely repeating recent history, says Kevin Meagher.
A new leaked poll shows Yvette Cooper in second place against Jeremy Corbyn - but there are reasons to be sceptical.
Labour will only secure a majority by persuading people who voted Conservative this year to return to Labour in 2020.
Keeping Londoners safe should be a top priority for any Mayor, says Sadiq Khan.
Your plans are neither safe, nor sustainable, nor morally okay.
The Welsh government will have to do more with less.
A court ruling that English NHS funding should prioritise English patients means that only Northern Irish women with money will be able to make the trip to get round the restrictive abortion laws in their own country.
Jeremy Hunt is at the centre with another row with the medical profession. What's going on?
The Liberal Democrats' short contest has allowed that party to get back on the road to recovery. Labour's long one has them on the road to ruin, says Dan Falvey.
The polls felt wrong at the general election. But nothing I've seen or heard suggests the polls showing Corbyn ahead are anything other than correct.
The Greens have a choice: persist with the old failed approach and get the same old disappointment. Or we can take ourselves seriously.
Property guardianships, where tenants trade rights for lower rent, look an attractive alternative. But London's property market means even they are increasingly out of reach, writes Maya Oppenheim.
There are two paths to a Labour victory in 2020, argues Michael Chessum: either Labour reject the principles of neoliberalism with Corbyn, or embrace them with Liz Kendall.
Lines in the sand don't make for good policy-making, says Matilda Murday of the Democratic Society.
Tim Farron smacked away the hand of friendship when Ed Miliband offered it, says Richard Grayson.
Steve Fielding, professor of political history at the University of Nottingham, reports from his local CLP meeting.
Labour's task is large - but not impossible. The party can still thrive if it pulls together.
These are new and challenging times for the Labour Party. We need new ways of thinking says Jon Trickett MP.
There's a danger that Labour's canvassing becomes a religion.