Hi Steven, I phoned my father, Denis Dwane, when I saw your posting. This is what my Dad told me over the phone tonight...
My great-grandfather, William Joseph Dwane, was born in Bromley, London and came to New Zealand in 1910. William had a brother named 'Steven'.
Willian Joseph Dwane's parents were John Dwane(from 117 Bromley Radcliffe) and Jane Gleeson (from 27 Exmount St, Mile End) They were married in 29th of Septmember 1887 in a Roman Catholic church in Mile End Old town. Roddy Dwane was a witness at John Dwane's marriage. Perhaps Roddy was John's brother? My father says that they came from a farming area.
John Dwane was an overseer at the Post office and his father was Michael Dwane.
Interestingly my father's family in NZ very much identified themselves as Irish and Roman catholics.
Perhaps your Dwane family is related to ours? My father has more correct and detailed information. It would be interesting to see how much more information we can find. ~Brenda, Auckland, New Zealand