Hi Dee, Wivenhoe, Jamjar and Judith
Wow the brick wall has come tumbling down very quickly

Quickly perusing the info have no doubt that this is the correct family with all the different spellings of the name, and will need time to digest everything.
Wivenhoe, that familytree site bears out with Dee's research - documented is Clara's marriage to Masterman, and father's name Simon Coringo.
Jamjar, the inquest info is
most interesting. Will follow up.
Judith, the death notice for Margaret Cornigo - feel it is important and connected with Dee's research and family history, as below.
Dee, so much info

- most grateful. At this stage the info that stands out is
Frances HALL aged 81 died at CFIELD in 1940
Father = Simon CORNIGO & Mother =
Margt LATIMERRef = 8178
and
Percival Lathmer NEWMAN born 30th October 1880 at Kooringa.
Father = Charles NEWMAN & Mother = Mary Jane CORNIGO
Ref = Bur 250/385
Percival Howard Latimer was my grandfather. On his marriage cert Broken Hill 1907, it is documented that he was born in Melrose SA, father=John Henry Latimer, mother=Mary Jane Coringo. Researched the JH Latimer side back to England and with dates etc. came to the conclusion that Percival was the result of a liaision

The Newman name is puzzling but could be correct as JH Latimer did not arrive in Australia till June 1880. On Percival's death cert (Vic 1946) the informant is not a family member and any details are not known.
Need time-out as the mind is in overdrive and get the info prioritised.....any clarification of what I've said will be most grateful.
Hugs to you all
Ashe