Self-flying fighter jets, uncrewed submarines and drones will be 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 said Britain would spend almost £300 billion (US$397 billion) over the next four years to modernise its armed forces amid rising threats. Starmer, expected to leave office next month after losing the support of Labour MPs, announced an increase in defence...