I think it is a great shame that the Government do not attend those negotiations, and I wish they would. I thank them for attending the 2014 conference on the humanitarian effects of war, and I thank them for their participation in the non-proliferation treaty, but I think they should go and support the idea of a worldwide ban on nuclear weapons. No one in the House actually wants nuclear weapons. The debate is about how one gets rid of them, and the way in which one does it.
There are questions, too, about the operational utility of nuclear armed submarines. [Interruption.] I ask the Prime Minister again—or perhaps the Secretary of State for Defence can answer this question in his response—what assessment the Government have made of the impact of underwater drones, the surveillance of wave patterns and other advanced detection techniques that could make the submarine technology—[Interruption.]