British Prime Minister Keir Starmer told Chinese President Xi Jinping on Thursday that he wanted to build a “sophisticated relationship” with Beijing to boost growth and security, signaling a reset after years of strained ties. On the most important day of his four-day visit to China, the first by a British prime minister in eight years, Starmer held an 80-minute summit with Xi at the Great Hall of the People before they lunched together. He will later meet Premier Li Qiang. “China is a vital player on the global stage, and it’s vital that we build a more sophisticated relationship where we can identify opportunities to collaborate, but of course, also allow a meaningful dialogue on areas where we disagree,” Starmer told Xi at the start of their meeting. Xi said ties with Britain had gone through “twists and turns” that did not serve the interests of either country and that China stood ready to develop a long-term strategic partnership. “We can deliver a result that can withstand the test of history,” the Chi...