It’s quite difficult.
Under Labor Party rules, a leadership election is triggered when a single candidate collects the signatures of one-fifth of Labor MPs. As of now, the number of signatures is 81.
The candidate must be endorsed by at least 5% of the constituency political parties or at least three affiliated organizations (two of which must be trade unions).
If a candidate meets these requirements, their name will appear on the leadership election ballot. Multiple challengers can participate in the vote if they meet the requirements. If current Labor leader Keir Starmer chooses to run, he will automatically be on the ballot.
The Labor Party’s national executive committee will then set a schedule for party members to choose a new leader on a one-man, one-vote vote.
But unlike the Conservatives, Labor has no history of regicide. The party has never formally challenged the incumbent prime minister. When Tony Blair resigned as prime minister in 2007 due to divisions within the party over the Iraq war, his long-anointed successor Gordon Brown was elected unopposed as prime minister and party leader.
Conservative Party leaders are easy to oust. Conservative MPs can launch a leadership challenge if 15% of their MPs write to the chair of the 1922 committee requesting a leadership challenge. Conservative MPs will then confirm their support or opposition to the leader in a secret ballot.
