Must…Fly has already answered, plus I added onto my original post.
As the system works when returning home from medium risk states, I should think the system can be used equally well when returning from overseas.
Getting people home from the airport needs to be worked out and hasn’t been discussed as far as I can see. For instance, if a family member collects by car, that person will have to isolate in the same house as well.
Maybe we'll be Zorbing home from the airport! Seems the safest way.....