Keir Starmer has insisted he would fight any leadership challenge - but acknowledged he needed to “turn things around”. After his Government was rocked by the resignation of Defence Secretary John Healey , the Prime Minister argued he’d made “hard-edged choices" to fund the long-delayed Defence Investment Plan (Dip) by asking all departments to cough up. And he issued a veiled warning to his rivals, saying any would-be successor would face the same challenges to balance the books while keeping