 A big win for Britain's Labour Party. 10 Downing Street with a new resident. Labour's Keir Starmer, now British Prime Minister, defeating the Conservative Party in a historic landslide. We did it! Winning a staggering 412 of the 650-seat Parliament. Starmer then heading to the Palace, where the King asked him to form a new government. He's Britain's 58th Prime Minister and Charles' third. ABC senior foreign correspondent James Longman. The heat is on across the West Coast.