Well well, it turns out just as we said.
Of course foreign children don't have passports.

What idiot thought it a good idea to stop children travelling on an id card?

New Brexit passport rules are ruining school trips for children https://www.mirror.co.uk/travel/europe/how-new-brexit-passport-rules-28508420?utm_source=twitter.com&utm_medium=social&utm_campaign=sharebar

🐦🔗: https://nitter.eu/catherinerowett/status/1593245261135941632