Not quite a brand-new discovery, but a confirmation, because it has been mentioned before as a recollection. But not seen before in these circles in visual form.
Lesley Nightingale in episode 1 of the six-part BBC1 thriller serial
Spyship from 1983
Title:
https://www.imdb.com/title/tt0142054/reference
Name:
https://www.imdb.com/name/nm0631467/
There was no other nudity in the series.