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Trident

May we take the case of Iran? May I invite my right hon. Friend to consider that there is widespread concern in the House that a state such as Iran, given the prospect of the UN not being able to dissuade the country, is more likely to use an independent nuclear deterrent against democratic states within its own region? We know that Iran sponsors the Taliban and Hezbollah. Concern is based more on that than on the potential threat of Iran using the weapons against Britain. May I invite my right hon. Friend to say a word or two more about how, in those circumstances, Britain’s retaining an independent nuclear deterrent will assist the world to dissuade a country such as Iran from threatening or even using its weapons?