Not sure that you should get singing tuition?
Have a look at the NEWZATS website. NEWZATS is the New Zealand Association for Teachers of Singing.
You could email the folks at NEWZATS if you'd like a referral to a singing teacher in your area: admin@newzats.org.nz
You could also contact Dr. Tessa Romano at the University of Otago School of Performing Arts for advice and a referral.
Private singing teachers:
Lois Johnston, 021 131 2969 or lusciousloisjohnston at hotmail.com
Also see Lois's Singing Tips YouTube Channel and Website
Isabel Cunningham, 027 209 7926 or isabel_cunningham at xtra.co.nz
Claire Barton, 021 444 997 or claire.a.barton at gmail.com