State of Decay (in-universe serial)

State of Decay was a serial of Doctor Who that aired sometime prior to 1981. Chris described the eventual novelisation as "the vampire one where the whole spaceship is a dagger in the giant vampire's heart". (PROSE: Fanboys)

River Song's diary contained a photograph of the Three Who Rule with the note State of Decay. (WC: )

Important note
This is a in-universe counterpart of the real world Doctor Who television serial State of Decay that exists within the Doctor's universe. It was mentioned in Fanboys, a short story written by Paul Magrs which was heavily based upon his childhood with his brother Mark.