"England could have close its borders and not permit anyone to fly, drive or sail to our shores. It’s not China’s fault. Society in many East Asian countries are back to normal."
Great idea. As most of our food and essential stuff is imported, we would have starved to death, or died from lack of medicines and certainly not been able to do much work. The oft-lauded Australians keep having outbreaks due to air crew. Most of our food comes in by lorry, approx 10,000 a day through Dover alone, plus other ports have RoRo ferries from the Continent with even more. It would be unrealistic to suppose that all those drivers are somehow immune from Covid, or that they could be prevented from leaving their trucks while in the UK (not to mention that many actually live here).
Possibly insisting on controlled quarantine for other travellers might have worked, but again, Australia has had Covid brought in by essential workers. Would it really be practical for every doctor, engineer, sea worker, consultant, etc who either needed to frequently do some short-term work abroad, or was needed for some short-term work here, to spend 10-14 days in quarantine? It's theoretically possible, but would even further mess up our economy, which is very internationally connected.