NJ's post takes too narrow a view of "prevent it happening". I don't mean "stop all deaths" -- that was impossible once the virus escaped the original source -- but I don't believe that what happened in March/April was inevitable either. At least one way to have reduced the issue, for example, would have been to not send sick people back to their care homes without establishing proper quarantine measures beforehand. That's a simple, clear, and obvious mistake that will have led to many premature deaths.
As to New Zealand, I am not sure that a local outbreak of just over a dozen cases constitutes a "new wave". The disaster in the UK (avoidable or not) arose because the disease was able to spread, undetected, through hundreds or thousands of people who'd travelled from across the globe and reached many of our cities, so that it sprung up more or less everywhere at once. It's a completely different picture, not just to New Zealand but also to the UK at the moment. Referring to the graph from earlier, it also shows that there have been no excess deaths in England/Wales for something like two months (up to the end of July), even though some people are still dying of/with Covid. At the moment, as far as I can see, data suggests that the virus is within the "stuff happens" levels that we can live with.
But we presumably would still agree that we ought to prevent, if at all possible, a return to the March/April/May horror show. Never mind the tens of thousands of premature deaths and severe illnesses from Covid alone if that happened, it would also cripple the health service in general again.