Alan Simpson: I was interested to hear what the hon. Member for Chingford (Mr. Duncan Smith) said, and I shall respond to just two of the points he raised. First, the hon. Gentleman asked whether we should be prepared to use nuclear weapons in a pre-emptive move against states that are in breach of the non-proliferation treaty or which threaten to breach it. The answer has to be an unequivocal no. I have...