UK Prime Minister Keir Starmer has publicly criticised Elon Musk after the billionaire businessman used his social media platform X to comment on a murder case that has prompted public anger and political debate across Britain.

Keir Starmer’s unpopularity has led the U.K.’s Labour Party to a humiliating defeat in local elections. Now, with five major parties competing for votes, the far right could be well positioned for a general-election victory.

The constituency is suddenly at the epicentre of British politics - and the by-election result could decide the next prime minister.