Imagine for a moment these two had secret chats over yahoo, Skype, text or email, recorded by GCHQ and passed on to the NSA. Now imagine how much power this would give anyone in possession of the damning evidence while Blair was in power and deng still married. This is why we can't trust the gov. or spy agencies with this sort of widespread surveillance - with it comes tremendous power which is more damaging to our civil society than the threat of terrorism ever will be.