How powerful is Keir Starmer?

With Labour nearly 30 points ahead in the polls, Keir Starmer is consolidating his position at the top. He said yesterday that Jeremy Corbyn will not stand as a Labour candidate in the next election, and he could be looking to reshuffle his shadow cabinet soon. How much power does Starmer have? Could he completely cut Labour's ties to the trade unions?

James Heale speaks to Katy Balls and the Times's Patrick Maguire.

Produced by Cindy Yu and Max Jeffery.