Jeremy Corbyn’s Left-wing allies are plotting to tighten their grip on the Labour Party with new rules to keep moderate MPs out of power for decades.

The Labour leader’s supporters are increasingly confident he will defeat Owen Smith in the leadership election this month, with polls suggesting Mr Corbyn could win by another landslide.

Mr Corbyn 's supporters are drafting a change in the party’s rules for future leadership elections that would give a “golden ticket” to socialist candidates, making it easier for them to win.

A separate plan, which was mooted by Mr Corbyn in July, would see Labour MPs forced to reapply for their own seats ahead of the next election, a move that many fear would result in radical grassroots members purging the party of moderate candidates.