LONDON — For Britain, this is a turn-the-page, night-and-day kind of election. After 14 years, the Conservative Party may be on the way out, replaced by an energized Labour Party led by former lefty lawyer turned ruthless centrist Keir Starmer. Campaigning for this surprise snap election lasted just a merciful six weeks. Prime Minister Rishi Sunak’s campaign has been dogged by gaffes and micro-scandals. Voters appear impatient with Tory promises of a sunlit tomorrow. They are ready for Labour.