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Trident

As the right hon. Gentleman knows, my background was heavily affected by the cold war; my parents came from Estonia. In the past, I assumed that deterrence worked. Does the right hon. Gentleman have a view as to whether nuclear weapons truly did prevent a hot war arising between the west and the east, or, in retrospect, does he think that we overestimate the impact of our having had nuclear weapons? I am equivocal about that myself, and I wonder what the right hon. Gentleman thinks about it.