Widespread testing of people who are asymptomatic will allow us to control the rate of transmission, identify people who must self-isolate and stop the spread," she added.

Take note Nathan !.like a border you try and reduce illegals or in this case potential carriers getting through.Its better than having complete lockdowns which we know will be much more harmful to people and economies long term.

https://www.bbc.com/news/uk-england-nottinghamshire-54887469