My Lords, I do not believe that we should underestimate the importance of President Bush's announcement last week. It is possible that some political commentators did not read President Bush's announcement last week quite as carefully as I know the noble Lord will have done. The noble Lord will be aware that the United States President said that the US could and would change the size, composition and character of its nuclear forces, and that in a different part of his speech he stressed the importance that he attached to international negotiations on what was happening not only in relation to nuclear missile defence but missile defence in general. At the moment the US is considering not simply nuclear defence but other very potent chemical and biological weapons, as well as the more conventional weapons that are being developed by some rogue states throughout the world.