Prime Minister Rishi Sunak, who has often looked exhausted as he crossed the country during a six-week campaign, started the penultimate day of campaigning before Thursday’s vote in a vast Ocado warehouse in Luton, north of London, watching robots pick items for delivery. Sunak, who shocked many in his party and the country when he called an election several months earlier than expected, has endured a tough campaign, facing questions from voters and journalists as to why the country is not in better shape.