Phillip Edward John STANLAKE lived in the district of WENTWORTH, NEW SOUTH WALES, perhaps that is where the children's WENTWORTH name originated.
Have you checked U.K National Archives for his BOER WAR & WW1 service records.
Australia, Electoral Rolls, 1903-1980
Name: Phillip Edward Stanlake
Electoral Year: 1930
State: New South Wales
Subdistrict: Bondi North
Sydney and New South Wales, Sands Street Index, 1861-1930
Name: Phillip Stanlake
Street Number: 92
Street Name: Matilda Street