VC10 never had Sydney postings - if they had I would have been on one!!! Comets did though, I was on those as well. Perhaps you are mistaking one beautiful aeroplane for the other beautiful aeroplane.
I seem to remember flying on" round the world wests and easts" as we called them, a lot on the VC10, and they always went through Sydney and Melbourne. I cant believe there were postings there as well.
I went on the 1st Aussie posting in October 1976 on the 747 and they were the 1st postings to Oz since the 707 as I understood it.