Hello All,
First, thank you all for your prompt and helpful responses. I'm new to researching within Ireland and the many links you've provided will be very useful now and in the future.
Also, my apologies for not responding sooner to your questions - some family matters arose requiring my attention. I will answer some questions now and provide further clarification as I absorb your posts.
To Hallmark
Religion - All those who came to NSW are Roman Catholic. I expect Garrett senior and Honora would also be RC. Thanks for your landed estates link.
To Sinann
Thank you for the link to Parish Registers. I see that Killarney records go back much earlier and will check out these in case the family moved around.
To Dathai
Re your comment: "Hmm quite a few around" ...
Yes, my earlier searches of more common websites revealed many Garrett Fitzgeralds and Honora Flahives but without information useful in filtering out the unrelated ones. Thanks for the many links.
However, I think you may have found something by using the alternate "Gerard" spelling of "Garrett" to find the mother "Honora Flahive" & the location GURRANE which I see is just north of TRALEE. Garrett junior's 1902 NSW Catholic Journal obituary stated that he was a "native of Tralee" but his 1859 Berrima NSW parish marriage certificate states his birthplace as Killarney. All "unknown" on his NSW civil marriage certificates. I will check it through.
To you all
I believe the connection to the Rev'd Fitzgerald-Day and his high standing is significant. Garrett junior was supposed to have arrived here in 1858 (44 "years in colony" on his 1902 death cert) and, within months, been appointed to the NSW Police in Berrima ahead of a serving Constable with good record from the nearby larger town of Goulburn. I had concluded that Garrett must have had a pretty good reference to achieve this. The news report of his appointment stated that as Garrett was "so worthy", other applicants "could not be considered".
I have to do some digging and calculate the years but it's possible that the mother of the Rev'd Fitzgerald-Day is related in some way to Garrett senior.
Once again, many thanks,
AUS_Mike