Hi Liz,
I tried emailing the State Library of Victoria yesterday and they have responded with the same arrival date 12 September 1923 that you gave, Averil.
This was their source:
trove.nla.gov.au/ndp/del/article/140825853
I hadn't thought of Trove newspaper arrivals! They weren't online when I was researching Cath in 2008.
But good news, LIz! Fits perfectly with their marriage having been planned well in advance. I wouldn't take much notice of the family stories of Cath wanting to get ahead of her two sisters. As the Australian family didn't know about George, someone might have given that as a theory for the quick marriage and it was passed on.
Will email you - hope same address.
Sue