Hi Jeff,
The seminal reference for men of the Imperial regiments took their discharge in New Zealand is
Discharged in New Zealand. Soldiers of the Imperial Foot Regiments who took their discharge in New Zealand 1840-1870 by H & L Hughes. (1988).
This extract refers to the 70th Foot:
page 110:
70th (SURREY) REGIMENT
Known as the "Glasgow Greys", after the place where the Regiment was first
raised and from the fact that they later adopted grey facings to their uniforms,
the 70th was summoned from Calcutta in 1861 to join the forces in New Zealand.
Stationed originally at Otahuhu, with a detachment as far away as Dunedin during
1861-3, soldiers of the regiment saw action in Taranaki in 1863 and in the
Waikato during 1863-4, returning to Taranaki and then across to Napier in 1865.
They left Auckland in January 1866 for England.
Unfortunately for the genealogist very few of those who took their discharge
in NZ had their particulars entered in full in the Muster Rolls.
If you are looking for a particular individual I can search my copy of this title.
Spades