SilverWook said:

Reel to reel home video recorders did exist in the 60's, and at least one Doctor Who episode was taped that way. Alas, not a lost episode.

My parents owned a 25 inch RCA console tv in 1966. ;)

Yes I know but I am talking about what was in common usage and the way the people who produced the episodes expected them to be viewed.

Maybe the UK was way ahead of where I lived but most people I knew didn't get a TV that large or a home recording device until the late 80s.

As I said these are just general trends I am not trying to speak for every person on the planet. Just give a general idea of how Tv was viewed and the conditions it was produced under in the 60s and 70s. That is all.