Let me associate myself with what the Prime Minister said, and particularly what he said about anti-Semitism and prejudice wherever we find it. On the point about British citizens who travel to Syria to participate in the conflict, does he agree that, with more than half of them having returned, we need to do more? In particular, does he agree that we need a much more rigorous approach, including compulsory engagement with de-radicalisation programmes to turn people away from violent extremism?