Yes, what’s the reasoning there do you know? With 4 months to plan we’re presumably not talking about unexpected contingencies but something fairly fundamental. But in relation to the model, it’s post-exit and all (willing and able) adults will have had at least one jab, the more vulnerable both, so I guess it’s not as significant a factor as it might be.
Those aren’t scare quotes around “exit wave” by the way - I’m not questioning the likelihood. But 30,000 always did seem high and it’s interesting and reassuring to see the official estimates being revised downwards.