“The Plague”, Scenes 31-33: The Side Room

On these albums

Doctor Who: The ArkPaul Erickson and Lesley Scott starring William Hartnell, Jackie Lane & Peter Purves · 2006Soundtrack

Doctor Who: The TV Episodes - Collection SixVarious Artists · 2013

Source: MusicBrainz recording c8320426-bf10-449b-8b9c-66fb2060dbf7 (CC0).