I visited the NHS coronavirus vaccine booking site just now to confirm that it is indeed true that you can find out whether someone has been vaccinated just by knowing his name, date of birth, and post code.
You don’t even need to get it right first time: I got the date of birth wrong in one case, and just went back to correct it. So if you don’t know the person that well, you can always guess.
The other day I had yet another text message inviting me to use the “My GP” app. Need I say “no thanks”?