France, May 11 -- In a major speech delivered in London on Monday, Starmer doubled down on his ambition to place Britain "back at the heart of Europe", insisting closer ties with the European Union were essential to reviving economic growth, improving living standards and restoring Britain's influence abroad.

The intervention came as the Labour leader battles mounting unrest within his own party following bruising local election losses across England and setbacks in Scotland and Wales.

Critics have urged him to announce a timetable for his departure, while allies insist replacing another prime minister mid-term would deepen political instability.

"I know I have my doubters and I know I need to prove them wrong, and I will," Starmer tol...