UK is heavily dependent on exports
We certainly do well with exporting variants...
What used to be known worldwide as the UK strain (reported here as the Kent strain) caused dreadful problems around the world. Now named the Alpha variant, it became the dominant strain.
Not one country in the world (with the exception of North Korea) has stopped essential travel. Imports and exports are still going on.
What many have chosen to do, however, is restrict travel to truly essential only.
They wanted to avoid the need for repeated long lockdowns.
They protected lives, health - and economy.
We had largely wide open borders, mostly without proper quarantine.
More than 130,000 dead (that's a lot of bereaved people who will never see their families again).
Vietnam, for example, has tightly restricted borders.
They have had around 50 deaths. In total. Since the very start in 2020.