Hughes Joseph Reverend of Chellaston Debryshire England

I have hit a brick wall I have traced my Great-grandfather Joseph Hughes by his birth and Baptism records 1832 back to London. His father was John Leonard Hughes (a Tailor of Bond Street) and his Mother was Margaret Jane.

John Leonard Hughes married Margaret Jane Skelton on the 9th October 1827, in the Parish of St Marylebone in the Borough of Westminster, it was a Parish Register not sure what that means.

I have traced the records for his sons Joseph Leonard Wharton Hughes (my grandfather) and William Henry Shaw (my Uncle) by his 1st wife Ellen Womack to New Zealand. My problem is I can't find out which ship they came to New Zealand in and what year. I know this is my right family because if you Google Joseph Leonard Wharton Hughes he comes up with a little bio on him. My Grandfather was an artist and was (taught by an artist of note) in Chellaston Derbyshire England. He first shows up in New Zealand in the census as living in the Bay of Islands 20 years of age, He spent at least 3 years living in Kaeo from 1896 - 1899 he married my Grandmother Barbara Murray there. BUT HELP how did he get there to New Zealand I mean.

My great grandmother was Ellen Womack, and her parents were John Womack and Sophia Wharton. WE were always told that Wharton was a family name of some inpotance but we all assumed it was on the Paternal side.