THE STONE TAPE (1972)

Nigel Kneale (the creator of Quatermass) wrote this very original teleplay for the BBC.  Directed by Peter Sasdy (who had just made three movies for Hammer Films), the story concerns an electric company that is re-locating to a renovated building.  The building has a foundation that probably dates back to before 1000 AD and before long they find that there is a "ghost" of a woman appearing in the basement.  The scientists working for the company want to invent a recording medium to replace magnetic tape and eventually everything falls together to make this a scary and weird viewing experience.  Jill Asher (looking a little like Mimsy Farmer here) plays one of the scientists who figures prominently as things unfold.  I can't say more without ruining it!