Sir Keir Starmer is doing all he can not to think about after Thursday, when the polls suggest that the first Labour politician to win a general election in nearly two decades. So when the Labour leader talks about his plans for after July 4 we have to sit up and listen. One area is on his plans to deal with the crisis of small boats crossings from France. As Starmer has repeatedly reminded us, more than 50,000 migrants have crossed the English Channel since Rishi Sunak became Prime Minister in October 2022. And we know that on “day one” (Starmer’s words) he will axe Sunak’s plan to ship migra…