Re: Currently working through the missing episode audios...
Exactly. There's a good dozen episodes that seem to have survived by what Richard Molesworth calls '"Why's this in my office? Oh well, it's a film print, better send it to the film library" route.
Where's Ian Levene when you need him?
The greatest science fiction series of all time is
Doctor Who! And I'll take you all on, one-by-one
or all in a bunch to back it up!"
--- Harlan Ellison, from his introduction
to the PINNACLE series of Doctor Who books