Self-flying fighter jets, uncrewed submarines and drones are at the centre of Britain’s future military under a defence plan announced on Tuesday that reflects a world of conflicts transformed by technology. Prime Minister Keir Starmer – who is expected to leave office next month after losing the support of MPs – unveiled his long-delayed Defence Investment Plan. Defence spending will increase to nearly £80 billion (US$105.85 billion) a year by 2029, putting it on a path to hit three per cent...