Thank you Ruskie, dylansmother & Aussie1947.
Interesting about the bankruptcy in 1888, but (presuming it was the same John) he had dtr Florence in Sept of that year, and another son in Nov.1890, who died Jan 1891, before moving.
There was another l-a-r-g-e Lebherz family (13 kids) there at the same time, so they might have been related. They are likely to have been German, but could also have been Swiss.
No, I haven't yet got John's D/c - just found out today that it was 1925 (under the spelling Le Bherz). He was also on the Aliens' List of 1917, and it looks as if he was naturalised on 25.5.1925. So if I don't have any joy with the D/c, I could try the Naturalisation declaration. I can also try the old Brisbane newspaper (Courier Mail?) if it is online, to find out the details of the bankruptcy. By reading the reports in the old papers, I learnt a lot about the life of one of my Gt-grandfathers who also went bankrupt in the 1880s.
Thanks again for your suggestions.