On November 23 1963, the day after John F Kennedy was shot, the first ever episode of Doctor Whos favourite TV show was broadcast here in the UK. In 2005 it came back after umpteen years away, re-invigorated and re-imagined. Some of the early episodes of the show from the 1960s were junked by the BBC, because they thought at the time that no-one would ever want to watch old fashioned black-and-white television shows. When videotape and DVDs were invented they started campaigns urging people to look down the back of the sofa, or in church hall crypts, hoping that someone, somewhere, had squirreled away recordings.”]
Source: https://nakedsecurity.sophos.com/2008/08/06/videos-lost-and-videos-nasty/