They weren’t fillers as such, they were paid advertisements.
Stefan used BTQ7 to film and broadcadt 5 minute adverts per day. QTQ9 had “How to get that job” with Sarina Russo. Both were moved around a bit to fut it with netwirk programming in tge lare 80’s.
Queensland Unlimited was a Sir Joh National Party paid advert seen on every QLD commercial station (including all 3 commercial channels in Brisbane) and aired at approx. 5.55pm on Sunday evenings asa lead in to the news. It lasted until Joh retured in '87. Political propaganda at its best!