LONDON — For Britain, this can be a turn-the-page, night-and-day type of election. After 14 years, the Conservative Occasion could also be on the best way out, changed by an energized Labour Occasion led by former lefty lawyer turned ruthless centrist Keir Starmer. Campaigning for this shock snap election lasted only a merciful six weeks. Prime Minister Rishi Sunak’s marketing campaign has been dogged by gaffes and micro-scandals. Voters seem impatient with Tory guarantees of a sunlit tomorrow. They’re prepared for Labour.