BBC1 airs the 34th episode of Doomwatch. This episode, guest starring Michael Keating (Blake’s 7), no longer exists in the BBC’s archives.
theLogBook.com
https://www.theLogBook.com
Earl Green is the creator, curator, and head writer of theLogBook.com.
Also of interest...
Doctor Who: Paradise Towers, Part 1
October 5, 1987
Voyager: Phage
February 6, 1995
Doctor Who: The Curse Of Fenric, Part 2
November 1, 1989