Thomson from the UK or Air New Zealand?

What a surprise when I saw this aircraft landing at Wellington today! It's a UK registered B737 in the colours of Thomson [thomsonfly.com]. Given that even the mere hint that an airline is considering starting services in New Zealand makes the "front page" [and nothing has been said], I was surprised indeed.

Turns out that this aircraft is being operated by Air New Zealand. I'm not sure of all of the details [can someone fill us all in???], especially as it still hs a UK registration.

In any case, it is always good to see new and interesting liveries flying around [some local operators could learn from this :-)].