RE: 106 BBC programmes have been unearthed
The BCC apparently has 106 40+ year old videotapes labeled "Dr Who".
If they can find equipment to run the tapes - The Center for Art and Media in Karlsruhe may be a good start -, the tapes may well turn out to be unplayable and/or disintegrate at the first attempt to digitise them.
Conservation of magnetic tape is a serious problem. According to Sarah Everts
(New Scientist, 24 Aug 2013) some 200 million hours of culturally valuable audiovisual content is in danger of disappearing entirely.
May be we should equate digitising analog videotapes with baking Babylonian clay
tablets by accidental fire which conserved them for millennia.