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Does the hon. Gentleman recognise that although the British deterrent is used all the time to deter, the only scenario in which it is conceivable that it would be fired would be in retaliation for someone having fired a nuclear salvo against us? Therefore, all the consequences that he mentions would already have happened, and the only question would be whether it would be worthwhile replying under those terrible circumstances. The purpose is to prevent anyone firing the weapons in the first place, and that is how we avoid the environmental consequences.