Yes, as a matter of fact, I do have further info.
I finally found my grandfather William's birth. He was registered as William Charles FENSON [with an N] instead of FENSOM. He had always insisted that he didn't have a middle name, and he had always celebrated his birthday on the 5th Mar, although his BC says he was born 7 Mar 1909. The parents names are correct, and the place of birth is given as Mile End Old Town North Eastern, London, England.
The BC for his sister Doris, who was born after the family arrived in Australia, says that at the time of her birth their parents had previous issue of Stanley 12 years, William 8 years, 2 males deceased and 5 females deceased. I also found one daughter born after her, who did not survive.
This is the whole family as they appear in my records at the moment:
Arthur John Fensom (b.1877;d.1922)
sp: Jane Sarah Burton (b.1880;m.1899;b.1953)
Child 1: Jane Caroline Fensom (b.1900;d.1900)
Child 2: Arthur William J Fensom (b.1901;d.1901)
Child 3: Ivy Florence Fensom (b.1903;d.1917)
Child 4: Maud Caroline Fensom (b.1904;d.1917)
Child 5: Stanley Thomas Fensom (b.1905)
Child 6: Unknown Male Fensom (d.1917)
Child 7: William Charles Fenson (b.1909;d.1964)
Child 8: Gladys V Fenson (b.1911;d.1917)
Child 9: Florence Mary Ann Fensom (d.1915)
Child 10: Doris Muriel Fensom (b.1917;b.1993)
Child 11: May Edith Fensom (d.1919)
My thanks for drawing my attention back to Rootschat, and for taking the time to read my query!
Donny