Hi there,
Re the 1938 letter that Jack sent from NSW to the UK .... Do you have the envelope? How did he spell the surname of Eileen's Dad on that envelope? or if you don't have the envelope, then from the letter, how does he address Eileen's Dad ..... as in :
"Dear ................." Reason for asking? Well, perhaps Jack survived Eileen, and if so, perhaps Jack was the informant on her death registration, and if so, he (or any one, as informant) would have been expected to provide the full name of her Dad, and the full name of her Mum, including Mum's nee name. Of course, he would have also been expected to provide the details about Eileen May, including when and where married, names and ages of the children of the marriage/s ....
The NSW death certs are quite informative, and are far more detailed than English ones.
Full name, sex and age, date and place of death, usual place of residence, usual occupation and marital status at death, Place of marriage, age when married, full name of spouse, Children's name and ages, Parent's names and mother's maiden name, Cause/s of death and duration of last illness, Burial or cremation date and place.
The Sydney NSW suburbs in the Canterbury-Bankstown district in the 1930s were split between several federal electorates: I think (not sure, but) : Lang, Parkes, Reid.
Cheers, JM