No, no, this is an uncharacteristic mistake. Keir Starmer’s welcoming hand on Natalie Elphicke’s shoulder is a picture his enemies will relish as proof he was never really a Labour man. Where was the steadying hand of a Pat McFadden or Sue Gray to make him stop and think: just say no? It is easy to see how, in the hectic frenzy of 24-hour Westminster, the astonishing gift of the most comically unlikely MP crossing the floor at PMQs looked irresistible. The wow factor was a great theatrical coup, a sugar-rush of triumph. God knows what’s in it for her;...