The problem is not that they may strike the usa with a missile, like max points out, the usa has a much bigger arsenal and has shown a willingness to use it. The thing i worry about is if they decide to pass this crap onto the usa's other enemies. The nuke in a briefcase has to be a massive worry for the States and its friends.

This has also set global nuclear decomissioning way back. How can anyone now seriously consider getting rid of our nuclear weapons? I hate nuclear weapons but im now certain the UK government will build more (its on the agenda to renew Trident this year), sadly i now think the UK would be idiots not too.