My wife and I had reason to be sat watching telly in a hospital ward for an evening last week. It was a cheap LCD telly with the sound set at an unobtrusive level and for some reason the picture was black and white. At first I just saw this as a minor inconvenience, the soaps were on so no problem but later it was switched to Poirot and then Blue Murder. Both are adequate but formulaic whodunnits I can take or leave but watching them in black-and-white genuinely gave both shows a sense of moodiness, foreboding even. It's one thing to watch Control or The Elephant Man this way but from now on I will watch The Bill and CSI in a mono stylee.