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Nuclear Submarines

I thank the Defence Secretary for his statement and commend him on his actions. He has acted, rightly, on the precautionary principle—and, God willing, he is acting more cautiously than is necessary. The UK has the highest nuclear standards, but one can never be too cautious on nuclear safety. If the decision has been taken to refuel Vanguard, which had not been anticipated or expected, and possibly others, what implications will that have, not for the operation of Astute but for the timeline of its production at Barrow?