Hi Leigh,
Re....
"4 His father was George, and his (step) mother Eliza - again fits the details for William Bell on my Grandmother's birth Certificate. (William Titley's biological mother, Agnes, died the year he was born, so probably from childbirth, and so Eliza was the only mother he would remember)"
I think you have William FITLEY's birth as 1859.
His mother did not die in childbirth. She died in 1860.
Name: Agnes Titley
Birth Year: abt 1841
Age: 19
Death Place: Victoria
Father's name: Farrel Bryan
Mother's name: Margaret
Registration Year: 1860
Registration Number: 11170
Mary