The leadership election, triggered by Ed Miliband’s resignation today, will happen under the rules agreed by the 2014 Collins Review, we can confirm. The plan at the moment is for a shorter election than the one that took place in 2010, with a new leader being in place before Labour’s conference in September.

The review changed the way in which Labour elects leaders, from a three-way electoral college system to a One Member One Vote (OMOV) system. Previously, equal weight was given to member, parliamentarian, and the trade union and affiliated societies sections – Ed Miliband famously won after a large victory in the third of these colleges.

Now, candidates will be elected by members, and registered and affiliated supporters, who will all receive a maximum of one vote. This means that, for instance, members of Labour-affiliated trade union will need to register as Labour supporters in order to vote.

In order to stand, candidates will need to be nominated by at least 15% of the Parliamentary Labour Party (PLP) – now 35 MPs. The vote, as in previous elections, will be held by the Alternative Vote (AV) system, and the deputy leadership election will be held with the same rules.

A meeting of Labour’s NEC will take place early next week to agree the timetable and procedure for the two elections.