Hi Kevin,
the job situation is hugely dependend on your area of speciality and the location of where you would like to work in NZ.
Best way to get an idea about job availability is to go on job search websites and see for yourself what's on offer.
On TradeMe there is currently 15 full time positions advertised ... that's for the whole of New Zealand ...
E.g.
Healthcare Jobs, Nursing Jobs & more on SEEK New Zealand
NZ Herald Jobs - New Zealand Employment, Careers & Job Search
Healthcare jobs in New Zealand on Trade Me Jobs
Home ? Kiwi Health Jobs
Or go to the DHB websites if that's where you would like to work.
Please be prepared that income in NZ is a lot lower than in the UK with less annual leave and less sick leave.
Good luck,
Fyzzio