Cannot confirm or deny whether such an incident took place, but a word on D-Notices (or DA-Notices as they are now known). These are issued as guidance to the media where information may threaten national security. There are five standing A-Notices (i.e. Military Operations; Nuclear and non-Nuclear Weapons; Home Addresses etc). They are not issued in relation to individual stories. In other words - nothing has been "issued too the press" in relation to this story, whether or not the incident actually happened.