There’s famously several missing Doctor Who episodes as well.
A lot of the 2nd Doctor is missing, some of the 1st. Some episodes have been animated, but some are only audio and still frames. It’s a bit rough to get through.
They are still finding new ones though! We may never see all of them, unfortunately, but we can see a large chunk of them. That’s something to be grateful for considering the circumstances.
The found ones pop up in the basements of New Zealand, South African, Australian TV stations that were sent tapes to play.
I was watching the Monty Python documentary and they mentioned this. I think one of the Terry’s bought the episodes, which were scheduled to be erased. Otherwise, no Monty Python for America. What was remarkable was many shows that the Pythons had written for, and the ones that had influenced them, At Last the 1948 Show or the Goon Show were gone. So in an alternate timeline, we might be huge Spike Milligan fans.
The tapes were huge, expensive and storage was limited. The tapes tended to get reused.
Technically not lost. Some alien civilization could’ve recorded it and we might some day be able to retreive it.
In the lost media community there is a distinction between things that are known to be lost forever (baring some miracle) and things that may still exist but either no known copies have been found or the owner refuses to release a digital copy (usually due to copyright reasons). For example most of the early seasons of Doctor Who were lost due to the BBCs policy but over the years copies of the film and even some rudimentary at home recordings have been found, allowing for them to be archived and preserved
Don’t tell any datahoarders about this, you’ll make them cry. I don’t fully ascribe myself that title, but this hurts me.
Dad’s Army lost three episodes also. All were refilmed in 2018/2019 and very faithful - highly recommended