Dear Janette and Spades
Many thanks for your quick replies.
Janette, thanks, I had seen the Waikumete burial transacription which I forgot to mention. Yes, I agree about incorrect info on the death certificates. The death certificate of another 2nd Great Grandfather in Foxton had his age 15 years out! In the case of WH Barnett, there are perhaps too many inconsistencies for me to feel confident they are one and the same.
Janette/Spades, unfortunately the marriage certificate is very light on information. Info included is simply the names of Harry Barnett, Elizabeth Lanfear, both of "full age", bachelor and spinster, Harry's occupation carpenter (WHW Barnett of Rotherhithe was a brazier at the time of his UK wedding to Emma Janes in 1875) as well as the location (dwelling in Victoria Street, Auckland) and date (12/02/1877).
Spades, thanks for your information on the Rooparell. I had seen the passenger list (for Elizabeth Lanfear) but I hadn't seen the government letters which offer some excellent insight.
Spades, I have no proof of my ancestor Walter Henry BARNETT as born in Rotherhithe, only London (as per Death Cert, my great grandmother's birth certificate and 2 WW1 files of her brothers). Yes, I suspect he is different to William Henry Walter BARNETT who was born in Rotherhithe. Unfortunately, I can find no birth (or otherwise) record of a Walter Henry BARNETT born in London in 1845.
I have just read about NZ "Intention to Marry" records which I hadn't heard of previously. Do you know if they provide any additional info to the marriage cert? If so, do you know how I could find this record?
Many thanks once again
Stuart