Closing our international borders would be nigh on impossible in stopping the virus or the mutations anyway. We may be an island such as Oz and NZ yet we are also among the most open international economies in the world and we are highly reliant on freight movement to and from the Continent for our food and loads of other stuff. Therefore with this amount of trade coming through our borders It would seem virtually impossible to keep the virus out. So this latest wheeze sure aint gonna work.