Yes. The economy would not have been unaffected, but it would have been an awful lot better than the current situation. And many many lives would have been saved. This is an island, for goodness sake! It should have been easy.
The Isle of Mann makes an interesting counterpoint.
Unfortunately, everything combined to create stupidity.
Conservatives adopted a daft "We are strong enough to cope with this virus!" stance. So ridiculous. A virus is not a terrorist organization--you don't defeat it by bravely shouting at it that "We are not afraid!!"
Left wingers spent a LOT of time wibbling and quibbling anxiously that closing borders/shutting off flights from China was somehow "racist"/might cause prejudice against ethnically Asian people (google "great COVID realignment" to see what I mean).
A lot of experts who should have known better acted as though spread of the virus was unstoppable and that closing borders would merely distract people from the need to "manage the curve of infections" within the country.
Meanwhile, countries like Vietnam and Taiwan ignored all the stupid sophistry and just went "OK, new virus from China. Bad news. Close borders." They were right.