requires both data about an individual's health and, linked to it, confirmation of their identity
I went for my second jab today, at the appointed hour that was set when I had my first jab. They couldn't find me or my reference code on the system! Luckily they agreed to vaccinate me anyway (I guess there's not a lot of motivation for old codgers to try to game the system somehow) so now I've got a paper card that says I've been vaccinated twice and that records my vaccine batch numbers. And I'm confident there's no computer-based record of it all. So how is any computer-based system going to validate that I'm vaccinated?
I have an Android phone. I haven't downloaded any apps onto it, because that would require me to have a google account, which I don't want (and can't figure out how to create anyway). So no app-based solution is going to work for me.
So it sounds like they will want to see my little piece of cardboard, if I haven't lost or burned it by then and haven't forged another, and make a QR code out of it somehow in order for me to be allowed to do whatever it is they say I have to be authorised to do in the brave new future.