We've spent the last few weeks watching the goings on at King's College Hospital in London, but tonight Channel 4 is giving us a rare chance to look at what goes on behind the camera. It can't be easy doing your job with all those people floating about. Believe it or not, there are 92 remotely operated cameras, and over 100 microphones on the ward, and it takes an awful lot of preparation to make sure no lives are put at risk for the sake of making good telly.