As Britain’s Tories decide who to elect as their next leader, the Labour Party has to address two urgent dilemmas of its own. One is the question of Brexit. Should Labour, as prominent figures like Owen Jones have argued, now abandon the idea of an alternative, “soft-Brexit” deal and campaign wholeheartedly for Britain to stay in the European Union?

Whatever view you take on that issue, it’s clearly a matter of huge importance, not just for Labour, but for the future course of British politics.

Labour’s second dilemma appears much more specific, and to a casual observer much harder to comprehend. How can it respond to allegations of pervasive, “institutional” antisemitism leveled by hostile critics?