Former UK prime minister Rishi Sunak on Sunday urged his Conservative Party to “learn the lessons” of their crushing election defeat as it gathered to begin electing a new leader. The four-day meeting in Birmingham, central England, comes three months after the Tories were ousted from power by Labour, with Keir Starmer taking over as prime minister. “This is our first conference in opposition since 2009,” Sunak wrote in parliament’s The House magazine. “We need to learn the lessons of our defeat: we did not get everything right in government — no government ever does — and we do now need to …