Deadly had a sidekick named "Weirdly Gruesome." They used to do "anti ads" sending up commercials.
Ian Bannerman as "Deadly Earnest" appeared on other Australian television shows - "Say in With Music" on 2 December 1967, "Personality Squares" from 27 to 31January 1969; and "Talk of the Town" - dates unknown.
Magazine reference:
Scary Monsters Magazine issue 115 (Winter 2019) pages 28-34 "They Came From The Land Down Under" - being a brief overview of the fascinating world of Australian and New Zealand radio and television horror hosts; written by Paul Gerard Kennedy; mentions this show and the host.