Thank you. On your final question, I have to say I'll happily take that and have a further discussion with the chief medical officer's department about shielding and families and advice that we should give to people about how to best protect themselves and their loved ones. I recognise there are genuine concerns that people have.

On the move to level 4 before Christmas, I do believe that we've been vindicated in the move that we took. I think it was absolutely the right thing to do. I've yet to see the measures that are being taken in England, and I completely expect that there will be more communities moving into higher levels of restriction because of the reality of the spread of the virus, and the reality that, without additional action being taken, parts of our healthcare system could otherwise face being overwhelmed. We can't expect our staff to run through brick walls on our behalf for another three months. We all need to be part of doing the right thing. That includes the Government, but it includes the public as well.

On the new variant and the school return, I have commissioned some further work from the technical advice group to understand not just the impact on transmission and children, but to understand what it means for how safe the school environment is, because whilst teenagers in particular are able to not just get the virus but pass it on to others, actually, they themselves are very unlikely to suffer harm. Conversely, though, I know that there are concerns for people who work in schools, but, actually, we don't have any real evidence of there being any kind of significant level of pupil-to-staff-member transmission, and that, I think, does show how successful our schools have been, and it's a real positive for them, about having a COVID-secure learning environment. What we do see, though, is some staff-to-staff transmission, and that's about people following the requirements in their own workplace to keep themselves and colleagues safe, and it's also about making sure that the mixing outside school doesn't take place as well, and that's why the stay-at-home period is so important for us as well.

What's different about the last week before Christmas, where we moved all high schools to distanced learning, is that non-essential retail was open for a period of time in that week. It's also the case that we didn't have a stay-at-home requirement, for people to only leave home for essential purposes. So, we're operating in a very different context moving into the new year, with the phased return that's been agreed, compared to that last week in December. But I do think that the research that I've commissioned from TAG, which I'd like to publish as soon as possible, will help to give more confidence not just to staff, because I am concerned that staff have confidence to return to school, but confidence to parents and learners as well that they will be able to receive some face-to-face teaching and learning, because we know that's vitally important not just for a general sense of well-being and mental health, but actually to get good qualifications at the end of this year as well, and I would not want to see that compromised, if at all possible. As ever, if the evidence changes, we'll need to consider what they means for us and the decisions we make. I want to assure the Member that I do have regular conversations not just with our chief medical officer and scientific advisers, but also regular conversations with the education Minister as well, to make sure that we understand how our plans are moving, including of course the plans for serial testing for secondary school aged children going back to school from January next year.