It would be cool if one of these hostages could give some sort of code out that only British intel could understand. I remember watching a documentary on our POW's during Vietnam and how one blinked Morse code to let it be known that he was not really confessing to anything. It was caught later on what he was doing.
During the Pueblo incident, the crew was flipping off the North Koreas claiming it was the "Hawaiian good luck sign". The beloved leader's henchmen bought it and published the photo
Time or newsweek showed the photo and the "real" explanation causing the prisoners to be beaten.