I don't think you can compare the UK with NZ re Coronavirus.
In NZ there is a population density of fewer than 20 people per km2 compared to 430 per km2 in England - surely NZ has a head start in the war against infectious disease? There is very, very limited public transport and far more people work for small business or sole trader type outfits here rather that the large offices in UK cities. People socialise differently too - in London we were at restaurants and bars every weekend , here people's houses. It also hit the UK mid flu season and NZ when is was still very warm early autumn. This also meant a lot of tourists were leaving, not arriving - it just isn't as busy as a transport hub.
NZ was still badly prepared had the impact been higher. My friend had to source her own PPE for her consultant DH and his colleagues, and with half the number of ventilators/ICU beds per capita than most European countries and not enough staff trained to use the ones they have (at North Shore Hospital anyway), the medical staff I know think it would have been a disaster.
And if herd immunity does turn out to have an impact and /or a vaccine isn't found for years, NZ is slightly screwed from a tourism and economic POV.
And selfishly, I want to be able to go home and visit my very sick dad before it's too late, so the idea that the borders will be closed for a minimum of 18 months or until a vaccine is found, is terrifying.