Hi Charlotte,
I had a quick look on their website, as I thought I had read something before.
Here it goes: Look at the Self-Evaluation Tool and click on criteria:
The Physiotherapy Board of New Zealand > Registration - Overseas Qualified Physiotherapists

I have completed;
....
2. A physiotherapy qualification from a three year undergraduate degree programme as my primary physiotherapy qualification and have:
Either:
A minimum of one year full time post qualification physiotherapy practice experience as a fully registered (i.e. with unconditional registration) physiotherapist in my country/countries of practice,

Or:
I am able to provide evidence of successful completion of a formal course of university level physiotherapy study additional to my primary physiotherapy qualification, i.e. Certificates of Proficiency, a Graduate Certificate, a Graduate Diploma, a Post Graduate Diploma or a Masters during the three years immediately prior to submitting my application for registration.

So, as you have not worked as a Physio one year full time, you will not meet entry criteria.
As far as I understand, this means that they will not accept your application.

Regards,
Andrea