http://www.strata-sphere.com/blog/
Excellent discussions here.
Lets be clear about what we are talking about here. One gram of PO-210 can kill 100 million people, and one still needs to wonder why three trips are required to move one gram? Are we talking three grams - one per each trip into London? That would mean enough to kill 300 million people!
People who wonder why I get tired and frustrated with the ever weakening assassination theory need to digest what it means to dismiss this alternative scenario. We could be seeing a sea of dead Litvinenkos soon, depending on how much PO-210 was traveling through London this October. And I doubt those three installments would only net 3 grams.
If the above is true, what if an Al Quida unknown enemy of the United States is/was the potential customer?