The slip was showing On Her Majesty’s Secret Service, broadcast on prime time TV for all Britain to see on the evening of 7/7 - but almost no one noticed.
It happened on a special called Target London. Rescue workers on one half of the screen, and on the other, Peter Power, a British consultant, innocently giving the game away.
Can you see what’s wrong with this picture?
Power: Today we were running an exercise for a company .... 1000 people involved in the whole organization - with the crisis team. And the most peculiar thing was, it was we based on a scenario of simultaneous attacks on a underground and mainline station. So we had to suddenly switch an exercise from fictional to real....
Interviewer: Just to get this right, you were actually working today on an exercise that envisioned virtually this scenario?
Power: Almost precisely. 
Within the hour Mr. Power was on the radio too:
Power: At half past nine this morning we were actually running an exercise for a company of over a thousand people in London based on simultaneous bombs going off precisely at the railway stations where it happened this morning, so I still have the hairs on the back of my neck standing up right now.
Host: To get this quite straight, you were running an exercise to see how you would cope with this and it happened while you were running the exercise?
Power: Precisely. 
You might need to be a paranoid 9/11 conspiracy theorist like me to understand what Mr. Power was saying, since as a normal person, he himself was surprised but not suspicious.
Well, this was exactly how the covert perps or moles in the US air defence agencies covered for whatever they had in the air on 9/11: with a drill for the very attack they were carrying out.
Here is how Watson and Jones explain it:
The exercise fulfils several different goals. It acts as a cover for the small compartmentalized government terrorists to carry out their operation without the larger security services becoming aware of what they're doing, and, more importantly, if they get caught during the attack or after with any incriminating evidence they can just claim that they were just taking part in the exercise.
This is precisely what happened on the morning of 9/11/2001. The CIA was conducting drills of flying hijacked planes into the WTC and Pentagon at 8:30 in the morning. 
Thus the drill also helps keep the number of witting accomplices small. You don’t need an entire agency made up of homicidal sociopaths.
Terrorism expert Webster G. Tarpley gives an example in his 9/11 Synthetic Terror:
Staff exercises or command exercises are perfect for a rogue network which is forced to conduct its operations using the same communications and computer systems used by other officers who are not necessarily party to the illegal operation, coup or provocation as it may be. A putschist officer may be working at a console next to another officer who is not in on the coup, and who might indeed oppose it if he knew about it. The putschist’s behavior is suspicious: what the hell is he doing? The loyal officer looks over and asks the putschist about it. The putschist cites a staff maneuver for which he is preparing. The loyal officer concludes that the putschist’s activities are part of an officially sanctioned drill, and his suspicions are allayed. The putschist may even explain that participation in the staff exercise requires a special security clearance which the loyal officer does not have. The conversation ends, and the putschist can go on with his treasonous work. 
How could this have worked in London? Mr. Powers would be like the loyal agent without the supersecret clearance; his job in the drill was to unwittingly help provide camouflage. Several participants could be given the “play-acting” role of terrorists who plant bags with “fake” bombs in them at the appropriate point in the scenario – but this time, real bombs were substituted. Whether witting or not, they would run no risk of arrest – it was “just a drill.” The WTC bombing of 1993 was perpetrated by the FBI in just this way: the patsies were told it was a sting operation to catch the terrorists, but at the last minute, live explosives were “somehow” used instead.
Hopefully, there are enough people out there who can add two and two together from Mr. Power’s candour. The drill and the confidential identity of the “client company” may have covered over the trail, so this might be the best smoking gun we on get 7/7.
Although it does seem this penchant for false flag ops is going to trip them up sooner or later. It’s gotten to be such an awfully regular habit, do they even know how to stop?
 Lampooning tyrants can be a good way of opposing them. No disrespect is intended to the latest victims of London’s atrocities by the title of this article. Nonetheless, some hypocritical shills may snap at this with crocodile tears, so don’t be fooled.
 WMV video file at http://www.terrorize.dk/misc/london/resources.php
POWER: Today we were running an exercise for a company - bear in mind now that I'm in the private sector - and we sat everybody down in the city - 1000 people involved in the whole organization - with the crisis team. And the most peculiar thing was it was we based on a scenario of simultaneous attacks on a underground and mainline station. So we had to suddenly switch an exercise from fictional to real. And one of the first things is, get that bureau number, when you have a list of people missing, tell them. And it took a long time -
INTERVIEWER: Just to get this right, you were actually working today on an exercise that envisioned virtually this scenario?
POWER: Almost precisely. I was up to 2 oclock this morning, because it's our job, my own company. Visor Consultants, we specialize in helping people to get their crisis management response, how you jump from slow time thinking to quick time doing. And we chose a scenario with no assistance, which is based on a terrorist attack because they've been close to a property occupied by Jewish businessmen there in the city, and there are more American banks in this city than there are in the whole of New York - a logical thing to do.
INTERVIEWER: How extraordinary today must feel for you as it unfolds. You mentioned a few moments ago there our experience with Irish Republican terrorism. And of course it was very different wasn't it because however perverted their behavior, the IRA believed itself to have some sort of code of honour, and tended to issue some kind of warnings, of course they often came too late to do any good.
 Paul Joseph Watson & Alex Jones, London Underground Bombing 'Exercises' Took Place at Same Time as Real Attack, Prison Planet
July 9 2005. With audio file and text transcript of Power’s statement on radio.
 9/11 Synthetic Terror: Made in USA, by Webster Griffin Tarpley, p. 204-205.