Now I know who gave me the cold! Anyway vaccine passports unfortunately have the habit of reducing vaccine uptake (when you force someone to do something and are so minded they assume there are nefarious intentions). They also hold questionable benefit on preventing transmission since delta. The places that would have required them would likely had such high viral loads that delta would have still spread if you had an infection person in the venue. I suspect that’s why the scientists didn’t push the passport issue with a government who is ideologically opposed to them. It made more sense for France when they implemented theirs as the delta variant hadn’t yet took off, so will be interesting to see how it progresses.