Well, Llywydd, the Member asked where the evidence comes from. It comes from the waste water surveillance survey that demonstrates that, when people come into Wales from other parts of the United Kingdom, then the rate of coronavirus found in waste water goes up and it is found in genomic evidence—important new genomic evidence. I referred to that in the letter that I've sent to the Prime Minister.

You see, where I differ from the leader of Plaid Cymru is this: he uses the language all the time of people from England coming into Wales, as though this was some sort of contest between Wales and England, and I've been absolutely clear that that is never the point that I have made to the Prime Minister. The point I make to him is that people from high-prevalence areas should not be allowed to travel to low-prevalence areas—wherever the high-prevalence areas are in the United Kingdom, wherever the low-prevalence areas are in the United Kingdom. So, this is not about stopping people from England coming to Wales, nor should we ever fall into that sort of way of talking. It is simply about preventing people, whether they live in Wales in a high-prevalence area going to a low-prevalence area in Wales or England or Scotland, or people anywhere else in the United Kingdom where the virus is in high circulation going to places where the virus doesn't exist in the same way, because when they do that, the risk of bringing the virus with them is inevitably and obviously increased.