I remember in the last series they had a highly implausible episode about secret CIA rendition of terror suspects - highly improbable, as if. And then...several months later the news broke....they must have some top spooky advisors to the script writers. When the news of the real CIA renditions broke it caused me to reconsider the episode regarding the security services involvement with the death of Di - which I previously felt was in the realms of the Daily Express, however if they were so on the ball about rendition flights.... makes you think. Nine years or so later and still waiting for the inquest....