A while back I tracked down the video clip from the show Gomer Pyle that was used for the “But there's somebody else that needs taking care of in Washington” background audio.
I know what you mean. I recently did the same thing for the little bit from Gunsmoke at the beginning of “Is There Anybody Out There?”, e.g. “Is it unsafe to travel at night?” - incidentally spoken by actress Diana Muldaur, who later played Dr. Pulaski in Star Trek TNG.
Now I wonder if Frankie Goes to Hollywood sampled the voice on "Two Tribes" from some 1950's British government film.
"If your grandmother or any other member of the family Should die whilst in the shelter Put them outside, but remember to tag them first For identification purposes"