Well - it looks like the only proof of vaccination is a sticky label. So if it is put on the letter of invitation, that is as official as it gets.

Given the way the Gov is handling it, they will run out of labels by the time I get the "call to arm".

Yea, Yea. proof of vaccine isn't proof of immunity or a measure of viral load. But tell that to the Hotel, or the Festival organisers. Not me.