I stumbled across this forum so I thought I'd give you my perspective...
I transferred to NZ Police in Sept '08, the second to last UK recruitment campaign. At the time of writing I have had several colleagues from my old force asking if they are going to do another campaign, the answer is no. The reason being they had been suffering from a lack of home grown recruits, partly down to the poor wage for a recruit to start on. They seem to have put a lot of work into improving the situation, and have vastly improved the numbers they're getting. Coupled with a few ex-UK officers going home before giving it a good go, it's kind of put them off. They do value UK officers here, I don't get any grief from Kiwi cops, they're very accepting in general. There's also cops from South Africa, Fiji, Malaysia, so they're used to a mix!
Perhaps one thing some people don't realise is NZ only one force covering the whole country, split into districts. I work in the Counties-Manukau district, which has just finished boosting the numbers by 300 officers, all fresh Kiwi recruits (with the exception of some 'retreads'). There's a MASSIVE difference in the many areas, from the usual city centre policing we're used to in the UK, to being a sole officer in a rural area or island somewhere - some great spots for the latter years!
I know a few ex UK officers who have still come over despite there being no specific UK recruitment, and they have started as a fresh recruit at the college. This means they start on the same wage as a new recruit (rather than having your service recognised and starting on an equivalent salary as we did) they have to complete 19 weeks at college (rather than the 8 week conversion course we did). Despite this, they seem to have stuck it out, and are coming out of the other end. I am surprised as I would not have been able to manage financially on anything less than I was on, and that was with 10 years service in the UK. (Another benefit we had is our UK rank is recognised, so I don't have to do any additional exams to get my stripes back).
The main thing we struggled with was that my wife couldn't get a job for about 18 months, partly down to her experience being in a field that is not really in existence here - she's working now but seriously considering retraining as a teacher). This meant we were restricted in our activities, which was frustrating being in such a beautiful country, a 3 hr drive away from ski fields and not being able to afford to ski!
Overall I love NZ, and I love working here. The lifestyle suits my family, outdoors stuff, but miss some of the activities for the kids such as museums, theme parks etc. Basically NZ history/buildings only extend back to the 1840's (I used to life in a cottage in England which was of that era, here it would be a museum piece!)
So the reality is there are no plans to have a UK recruitment drive again, though never say never. If you have the financial security to take the hit for a few years on a low salary, or your other half happens to be a nurse (they get paid better than us!) or another profession which is sought after (check out NZ immigration for their list of desired professions) then I would say go for it. If not, wait to see if they do another campaign.
~If you are still interested, I can give you any info you want, immigration, college, what it's like working here etc etc just ask away!