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Trident

I am grateful to my right hon. Friend. On the question of parliamentary scrutiny, I understand that she cannot bind future Parliaments. I noted that the Secretary of State for Environment, Food and Rural Affairs announced yesterday that the Climate Change Bill would bind future Parliaments, but I understand that my right hon. Friend is reluctant to do the same. However, will she at least express the opinion to this Parliament that it would be desirable and appropriate for it to be able to take a view at some point in the future—perhaps around the time that the main contracts are let—on whether international circumstances still require us to maintain an independent nuclear missile system?