Thomas was married according to some of children's birth certificates on 24 May 1865 in Ross, Westland, New Zealand, but I have been unable to locate and get a copy of marriage certificate. Have found on Familysearch website but for 5 years later i.e. 1870

but do not seem to be able to find anything else about their marriage to be able to get a certificate

He was married to Ellen Trow from Shropshire, and all their children were born in NZ, I have managed to find all of the children's birth dates etc
According to his Death entry, his parents were Thomas Pearson, farmer and Charlotte Pope. Do not know of anything else whether there was any siblings etc.
Thank you for your suggestions, yes, I think I might try census lookup and see what happens there, as I have been able to find out more about his wife's family that way, it was just the fact that I wanted to find out what the place name should have been.