Looking for Families of J Walter Bull George E Bull of Gisborne Nz

Hoping to trace families of the above. They were born in Derby UK to WILLIAM BULL & JANE JOHNSTON. Came to Australia in 1870, then to NZ. JANE died at Gisborne in 1900, after coming from Bendigo, Vic, Australia, about 4 years earlier, according to the obituary in the "Poverty Bay Herald". Apparently there was a connection with the shipping pilot service in Gisborne, and also at Williamstown in Melbourne, Vic. Would be interested to know more.