The Labour Party is considering a major change in the way it elects its leader to allow party members to force a handover of power through a no-confidence vote, or to block an attempt by caucus to roll the leader.
The group set up to review the Labour Party after its poor election result has recommended party members vote on the leader. At present only MPs elect the leader.
Party president Moira Coatsworth said it was "a significant shift" for the party.
"At the moment, because it is a caucus decision, caucus at any time can walk in and have a vote. So this would decide on mechanisms for triggering [a leadership vote.]"
New Zealand and Australia were the only Westminster countries in which the equivalent of the Labour Party did not allow members to vote on the leader. The Irish Labour Party required support from two-thirds of caucus and a proportion of the membership to force a leadership vote. In Canada, members could seek a vote on the leadership on a regular basis at policy conferences.