thanks Sue for all of that information. I agree with you re the wasting time bit!
The Nicolson family I am "sort of" on top off! Where it shows Adelaide, this in fact Adelaide Lead, a place near Maryborough,Victoria.
I am more interested in the White/ Corbett connection. I have all the Gill family info that you mention and I am following up on at moment,so any further information there would be appreciated.
As far as Johanna Corbett marrying John Garvin, I have no information at all,so this indeed is a possible lead and any further information would be appreciated

The "big" information that is really being elusive is the Irish records

Perhaps the Australian records may turn up a bit more to work on

Larry