Thank you all for your time and efforts. it is much appreciated.
JM, as you point out I guess it would have been an assisted passage, may be like WW2 when they had a complete 'war bride' ship. As for the three sons I have no idea if they still live or had their own families, all I have is first names, this all rests on finding the family name

All searches suggested are real possibilities, even the local RSL may be a go, but I really require a surname to turn up any usable data, this is why I have tried to concentrate on that address as I feel it is the 'key'.
Hey Sue, that advertisement may be a real lead as the 'C' may be one of the sons and I shall try using the name to see what pops up. Amongst some old photos I have is a picture of a house that matches Google images, but 70 or more years ago
Hi Jennaya, Grandad married a Katarine Simpson 23/09/1894 [probably Kathleen] at Fitzroy, the story goes that GF had made a bob or two prospecting and set up a business [where or what not known] and then had to return to the UK for a short period, on return he found business and wife gone

[off records too!] by 1901 he was back in the UK running a lodging house in Poplar High St