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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.
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It is bollocks, just something I was told by a colleague when I used to work for the NZ government.
However the NZ diaspora is approx 13% of the population but the majority of them are in Australia
“While most New Zealanders are resident in New Zealand, there is also a significant diaspora, estimated at around 750,000. Of these, about 640,800 lived in Australia (a June 2013 estimate),[1] which was equivalent to 13% of the resident population of New Zealand. Other communities of New Zealanders abroad are heavily concentrated in other English-speaking countries, specifically the United Kingdom, the United States and Canada, with smaller numbers located elsewhere.[2] ”
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.