Mac OS actually lets you do English (Avganistan) or English (Somalia) or whatever.

It's just English (I don't know when it's US and when it's UK, it's UK for Poland), but with the date / temperature / currency / unit preferences of whatever locale you actually live in.

At least for any country in continental europe "English" is usually "English International", meaning English UK.

Maybe there are some exceptions if we speak globally, hence limiting myself to europe. But I assume it is the same deal.