There were people around Jeremy encouraging him to set up a new party and I told him not to, she said. It's very difficult under the first-past-the-post system for a new party to absolutely win. If it wasn't first past the post then you can see how a new party could come through, but I understand why he did it.
Corbyn has confirmed he is in discussions about creating a new leftwing political party, following Zarah Sultana's announcement she was quitting Labour to co-lead the project.