One in four Labour supporters want the party to split if it loses the general election, a poll for The Sunday Telegraph has revealed.

The finding will embolden Labour rebels who are mulling over whether their best chance of a return to power is under a new brand.

Earlier this month Lord Mandelson, the former Labour business secretary, noted that Emmanuel Macron’s shock presidential victory in France was achieved by abandoning his left-wing party.

There are widespread concerns among Labour moderates worried that Jeremy Corbyn’s left-wing agenda for the party is corroding its chances of winning back power in the long-term.