Compartmentalising countries as a weapon against the virus can work - see NZ, IoM and even China. But as soon as you allow outsiders in you create a potential entry point for the virus, as China and NZ have just found. It's not unexpected, it just illustrates the problem. Entry quarantines can help but they are not perfect, and I agree they are pretty pointless in the UK when at the time of writing we have a higher infection level than most other countries ("Thanks" Boris). Whether the entry quarantine stays (or ever gets enforced) is anybody's guess, especially if neighbouring countries (not unreasonably) take reciprocal action and the airlines kick up a fuss. Unfortunately managing the virus spread is totally a political matter, and "led by the science" all too often means picking the bits you like and using scientists as human shields when it goes wrong. So don't expect much consistency in border policies for a while yet.
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