I was inquiring since most of 1977/1978 episodes were wiped. on Youtube they have countdown at the movie Premiere of Grease. Molly talks to Olivia, John Tavolta and Andy Gibb. The interview is about 10 mins.
That comes from an off air recording that was recovered (in Queensland I believe) from an old video tape. It is apparently the July 16 1978 episode. I think Troy had something to do with finding it and he handed a copy over to the ABC but it is not in broadcast quality so unfortunately it won't get aired.
I got a copy of it years ago by accident via this site. A guy named Jan in Poland left a message on this forum in around 2005 asking if anyone had a copy of a Suzi Quatro hosted Countdown that he was after. I may have been the only person who responded to his request for help. He said he had a lot of music items that he was happy to trade. It was mostly 60's and 70's artists and European music shows of the era - not what I was after but very impressive in quantity. In amongst it all was this Countdown episode that I had not heard of so I asked for that as a trade. It has obviously been widely traded if people overseas have copies.
The playlist of that episode hosted by Jon English is:
Graham Bonnet - Warm Ride (video) - apparently extremely rare clip
Genesis - Follow You, Follow Me (video)
Flash & The Pan - Down Among The Dead Men (video)
Russell Morris - On The Wings Of An Eagle (live)
Angels - Take A Long Line (live)
The Clouds/Clowns? - Marion (live) - couldn't make out the band name when it was announced, a Perth band that don't appear in my reference book.
Frankie Valli - Grease theme
Humdrum - Grease premiere/John Farrer interview
Bryan Ferry - What Goes On? (clip) - only a guess, I didn't know the song
John English - Words Are Not Enough (live)
No1 Boney M - Rivers Of Babylon
I've only got about a 6th generation copy with some pixelation caused by scratches on the disc (Jan wasn't too quality conscious).