Hi Shane,
I posted my last two messages before I saw your ones. You asked "Does the birth cert. lead me to believe his full name is John William Davidson Dumbell".
- No, that birth cert was for his son. As was the last one I posted, for their eldest son John Thomas Dumbell. Both show up in NZ records with their families.
It is this cert which you need to get from England:
Marriage:
Name: DUMBELL, John & SCHOFIELD, Ellen
Registration District: Haslingden
County: Lancashire
Year of Registration: 1857
Quarter of Registration: Apr-May-Jun
Volume No: 8e
Page No: 158
Let me know if you need instructions on how to do this online, and I can send them to you directly.
Sue