SAGE has concluded that, even with careful planning, there may not be any net benefit to COVID immunity certification, and indeed a paper of one of its sub-committees has argued that a domestic certificate—which is what we're talking about, rather than a travel certificate—has the potential to cause harm. The technical advisory cell, in its summary, cites two major UK studies that conclude that vaccine certification and COVID certification could be counter-productive, reducing the likelihood of vaccination amongst groups with lower take-up. Do you accept that limiting people's ability to engage in certain activities, based on their certified health status, sets a very uncomfortable precedent? We only have to think back, don't we, to the AIDS epidemic to realise why.

Under these circumstances, I think it is reasonable to expect the evidential case to be clear and cast iron, whereas in the words of one of the Scientific Advisory Group for Emergencies's most prominent members, at best at the moment it's very mixed. To enable us as a party to come to a final decision, an informed decision, would you agree to our being presented with an impartial assessment of the COVID pass proposal by the chair of the technical advisory cell?