It's kinda disturbing that so many of the people being implicated in the British plots seem to be doctors... it's a movement that usually is portrayed as praying on young, nieve and uneducated men for it's core, but apparently there's always been a strong intellegensia component to al qaeda. And of course, anyone with those sorts of credentials will be much more free to move about.
http://www.cnn.com/2007/WORLD/europe...ors/index.html