Thanks Lu and KHP.
Joseph Page's first wife Eliza died on 24 December 1886 in Lyttleton (Lyttleton Times 29 Dec 1886, pg 2).
The 1905-06 ER for Lyttleton has Joseph Page at Old Governors Bay Road, Dampiers Bay, Lyttleton, Shipwright.
There is an "Elizabeth Blackburne Page" at the same address, presumably his wife. So this adds another name "Blackburne" to the picture. Was this her middle name, given that Elizabeth and Roseanna were "Misses" when they arrived in NZ?
Will keep searching to see what I can find.
Wendy