It's one thing to expose a Pengaton conference's attendees list, and another Mr. Blair's security plans intended to protect the Prime Minister from a terrorist attack during the Labour Party conference".
From the article :
"Security plans intended to protect the Prime Minister from a terrorist attack during the Labour Party conference have been left in a hotel. The documents include a list of ways in which Mr Blair and members of his Cabinet could be killed as they attend the five-day conference at Manchester’s G-Mex Centre in September. Greater Manchester Police said that the dossier, found at the Midland Hotel, had been left by a member of hotel staff but insisted that the plans were not secret."
Every country has it's reputable think tanks, whether representing PhDs' with eyeglasses thick enough to have the sun burn their eyes, or plain simple analysts, worst case scenarios when protecting national leaders are among the top priorities. I think that even if the plans weren't secret, they reveal a lot of info on the security agency's thinking and hypotizing approach, still, no advantage could have been taken given the short timeframe -- thankfully.