Labour members can vote via post or online and must choose a candidate using the alternative vote (AV) system.
In elections held under the AV, each voter ranks candidates on the ballot paper in order of preference (1, 2, 3 etc.).
After marking their first preference, voters may then choose to express further preferences for as many, or as few, candidates as they wish.
The count begins by allocating votes in line with first preferences.
If a candidate has an ‘absolute majority’ – more than 50 percent – of the votes after this allocation they are elected.
