The first Series were broadcast live, can you imagine that today? Lots of Series were, with film Clips for the outside scenes. There were some hilarious bloopers then, but we didn't know better and enjoyed them anyway.You must realise that T.V. was only B/W and our Screens maybe 15 Inch. I remember the Play "1984" was also broadcast live, it made such an Impact that they did it again the following evening, also live.