My prediction is as soon as the schools have broken up everyone is going to want one. Although many people would take the risk with their work colleagues or children's class mates, they won't take a risk with elderly family members.
Do you think Matt has factored this in? I can only imagine by Christmas there will be an enormous backlog of tests again and then over Christmas the labs will be short staffed due to holiday leave. Just imagine the disappointment if there aren't enough to go around and it is like at the beginning of September all over again when no one could get hold of a test.