D-Notice

Per the Prime Minister's instructions, the Minister issued a D-Notice on the Embankment tube station incident. (AUDIO: Ruffling)

Behind the scenes
In the real world, a Defence Notice (D-Notice) is an official request to editors not to publish or broadcast stories believed to jeopardise national security. It was renamed to a Defence Advisory Notice (DA-Notice) in 1993 and is currently known as a Defence and Security Media Advisory Notice (DSMA-Notice).