Willesee at 7 was a long-running nightly current affairs program on Seven Network which ran from 1976 and early 1982.

ABBA were interviewed by Paul Makin, the "light interviewer" / comedian on Willesee at 7 in the same hotel room at the Sebel Town House hotel as that featured in Sounds Unlimited  ie. with a big rug of a butterfly behind them not the gold records as featured in the press conference.

There isn't any footage of this interview (at least that I can find) but you can hear the interview (in the VIDEO section).  Please be aware that the description says that it's from 1976 and most of the pictures are also from 1976.  But the interview is from 1977.

Thanks to Roxanne Dickson and Ian Cole c/o ABBA Village plus Jozsef and Nicholas Fältskog, Philip Muytjens, Matti Crocker, Ian Cole and Philip Walkley c/o ABBAtalk
YouTube link c/o ABBARoxAus