As I've indicated, we have developed our systems to the point where we're able to respond to cases without alert level escalation, but we can never eliminate the possibility that something that's highly unlikely can happen. That has happened with the cold store cases that we dealt with in August last year, and it has happened in these cases here. There is no likely known identified source of transmission at this point, so we continue to investigate to see if we can identify what that was. Bearing in mind that in the August case, we were not able to identify conclusively how COVID-19 made it to that cold store, which then caused the restrictions that we had, and we may not be able to find to the point of any kind of certainty what has happened here. But what we can do at this point, and why we need the lockdown, is we've got to eliminate the risk of it having been out there spreading in the community. That is what widespread testing is all about. That is what these restrictions are all about. We have done this before. The team of 5 million has risen to the challenge before and it is doing so again. There are no easy options here. If there were, we would have done them by now. We are always looking for how we can improve our response. We make changes where they are sensible to do so, where the science and the evidence backs them up.