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I don't know if it's equal proportionally, but I doubt it. London is an international travel hub, global financial centre, incredibly popular tourist destination, and very easily accessible to a huge number of people comparatively. But even if it were, it's a question of opportunity to transmit as much as (more than?) proportion. Absolute numbers matter in this case. Especially once density is added to the equation. You drop 10 ill people into a city vs 1 you'll have a much more difficult time responding. Now make that city 10x larger. Now increase the density n times.
Edit - a quick Google says there were fewer than 4 million international visitors to NZ in 2018. 11 million passengers used Eurostar the same year.
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That said, the NZ population in entirety is around 5M. In 2019 the ONS reckons just shy of 40M visitors in the UK so proportionally the number of tourists isn't that different. That said, I reckon a lot of people go to NZ for the countryside not the cities, whereas I bet London is a huge draw for UK visitors.
I guess my point is there are similarities and differences. Nothing to see here :)
Per head, I’d have thought this was about the same. Please correct me if I’m wrong.