The House will be aware of the hon. Gentleman’s consistent views on this subject. The goals of the conference are unclear and, consequently, none of the P5 nuclear weapon states has attended the conferences in the past, as he said. We do not believe that a ban on nuclear weapons is negotiable, nor that it would even be observed by many nuclear powers. Even if it could be achieved in theory, in practice the confidence and verification measures that would be necessary to make it effective are not in place.