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The question is what percentage of people crossing UK boarders are doing so in the name of goods distribution, compared to business/pleasure.
I don't know what the split is, but I'd guess at less than 10%. Also, lorry drivers are likely spending most of their time in their cabs, rather than attending gatherings / getting on public transport.
We could have closed borders while allowing freight distribution. Even better if that goes hand in hand with rapid testing now.
Here's one reason: food.
Quick edit: Quick google says 11.53% of NZ food is imported. 50%ish of UK food is. NZ food is probably not coming in on (tens of?) thousands of lories each day being driven by real people who continue on their way to warehouses all across the country.