From this thread:
http://www.freerepublic.com/focus/news/1438133/posts?q=1&&page=3701
Classified - No clue
Open - I am not aware of any traffic posted in excess or out of what had become 'ordinary'. Now, post attack chatter is probably huge.
"BUT, if there was no chatter and London was caught completely off guard, what are the chances of having an
terrorist operative inside the British Government/Scotland Yard/SIS?"
According to PBS radio station early this morning(~6:30), Scotland Yard did forwarn Israel right before the blasts occurred so they had a short warning of some sort and at 6 AM they were saying it was Al Quada, no doubt.
I think Scotland Yard should check out their translators.