Thanks to Wivenhoe and Chempat for your interest and help.
WW1 enlistment #2518
LENARD Stanley John b. Albury NOK wife Evangle...This is my Grandfather and Grandmother. The name changes throughout the war records. And his registration no. changes too.
I have found relatives from his other family and the parental story is that his parents were killed in a car accident and he was bought up by an Aunt.
He has obfuscated his birth info and name to cover his tracks - as he walked out on Eva and the girls.
When his mother/aunt Ellen Elizabeth Leonard/Elizabeth Ellen Leonard/Helen?

died the police visited Eva to ask for money for her funeral. My mother was a young girl and remembers this so it could have been between 1930 and 1942 Melbourne. She was buried as a pauper. I don't know why Stanley who was still alive in Albury didn't bury her. I found a death at a hospital that matched her in 1942 but Mum says at that time she was 22 and that is too late.
The birth to Helen/Edward 10743 / 1889 LENARD Stanley ps Edward / Helen Albury
This maybe the birth. The spelling of the name is the same as his second war record. Whether this was a mistake or on purpose I'm not sure. He has lied with other details so its hard to know what the truth is. Will look at my certificates later today, before ordering more. And have asked other family for more details. The matter is very sensitive in view of the other family.