yeputons

You have to bring in loads of other random documents to get a passport, for example: https://news.ycombinator.com/item?id=44408872

To reliably prove your age (e.g. in a store or a concert venue), you have to get a provisional driving license. If you are not qualified (maybe still disqualified to drive, or eyesight problems), tough luck, I'm not aware of any other government-issued photo ID in the UK. Foreigners previously had BRPs, but they are not issued since 2025, everything is electronic now.

There is also the "PASS" scheme where private providers (like banks) can issue plastic cards with photos, but I've heard they are regularly rejected by various venues as proof of age and/or identity, there is no legal requirement to accept them, just a recommendation. And I can imagine non-UK entities care about these about as much as they do about ISIC. TSA was definitely unhappy when I tried using ISIC about ten years ago for a US domestic flight.

And for some passports in the last, say, six years, the probability is significantly increased. There is no official information as far as I know, just some anecdotical evidence from forums.

And before all of that you have to remember all your trips for the last 10 years to enter into DS-160 (you learn to keep a spreadsheet after the first time you do that, UK visas require that as well). And secure an appointment, which (since 2025) must happen in the country of your citizenship, or the country of your residence, which you should prove (sometimes it takes years to get residency documents in some EU countries). If you're unlucky, the waiting time for an appointment might be measured in years too. If you get a waiting time after all, sometimes there are just no appointments available whatsoever with no extra information.

Attending a company event is, of course, not a valid reason to get an expedited appointment. At least not that I've heard.

And I'm sure there are even more tricky things that I haven't heard of.