The latter question is really a question tied to the certification work. We have not hitherto, as my hon. Friend well knows, said that the rules for people who are vaccinated should be different from those for people who are non-vaccinated, but we know that some other countries are proposing to say that that will be case for international travel, so we do need to have a way of showing or proving it. However, we have not yet come to any conclusions about how we should do that and whether we should do that domestically. That is a matter for the Chancellor of the Duchy of Lancaster.
On measuring how effective a second dose is, we have tests in the field right now to follow a sample of people who have had both tests, having them tested regularly—weekly, typically—to check whether they test positive, and therefore testing the effectiveness of both of the vaccines in the field. So far, we have published the results of that after one jab. Very early results are coming through after two jabs, and in the next couple of weeks we will have some really rich data on that, I should hope, because we have now seen a significant number of second jabs—10 million as of midnight last night.