I know the busker who watched it all.

"He said they put chalk marks on the ground where the actors, sorry terrorists, involved had to stand.

"He said it was so obviously fake; the police threatened to beat him up unless he moved and kept his mouth shut."

http://aangirfan.blogspot.com/2013/05/woolwich-false-flag-inside-job-fake.html

Don't know who you are, dude, but intelligence agencies tie up loose ends after operations like this.