On the "Olivia shacks up with Bruce" bit (and with a name like "Bruce", surely it was a no-brainer?), I still recall the first time I ever heard of Livvy. It was in the second half of 1966 in the back-page gossip column of the New Musical Express, which rejoiced in the byline "Alley Cat". Alley Cat was written in an idiosyncratic note form, never a complete sentence and no verbs whenever the context and the gist would allow it.
Thus it was that the first UK press mention of ON-J that I can remember came in the form of a slightly-cryptic note: "
Shadow Bruce Welch's new girlfriend Olivia Newton-John an absolute stunner". [From what I recall, that is more or less verbatim - it is possible that the word "Shadow" wasn't there.]
But we in the UK never heard much more of Olivia until the doomed film "Toomorrow" came out in about 1970. Then the following year, she started to have hit records (thanks to Bruce and John Rostill).
https://en.wikipedia.org/wiki/Toomorrow_(film)