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New Zealand has a very well travelled population. IIRC one of the countries with the highest rates of passport ownership. It used to be the case that approx 10% of the population. We’re out of the country at any one time, and half of them were in London, making London the second largest kiwi city.
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half of them were in London, making London the second largest kiwi city
That's probably bollocks. A bit like London isn't the 6th biggest city of French people.
ONS estimates in 2015 the New Zealand-born population of the UK stood at around 59,000. That's residents but even allowing for a bunch of tourists it's a long way to go to get to 377,000 to overtake Christchurch.
I have no idea. I would assume that New Zealanders tend to travel abroad at a lower rate simply because they don't have so many countries right on their doorstep. Neither here nor there though, considering they closed their borders quickly.