The more important decision concerns Britain's place in the world. After the Second World War, the depleted state of the nation's finances required the famous retreat from empire. Now, a combination of a decision to abandon Trident and to continue the pull-back from the war on terrorism would signal a further retreat down the league table of nations with a credible military capability. As a conversation with leading Pentagon figures makes clear, that credibility is already damaged, which means that America no longer counts on Britain as it once did, and is in the market for other allies who can and will assist it in the post-Bush age, when trouble strikes.
At the moment though both major parties are considering dumping Trident because of the costs.