Note to dimwit colleagues: "Reply" != "Reply all", which is especially important when the original email was stupidly sent, individually, to every single member of staff in the University.
I just got a message that said, in its entirety,
and which was sent to 1,591 people. It's like we've travelled back in time to 1995, when people were "still getting the hang of email".
Unfortunately, the original error seems to be propagating, as more and more people weigh in (the first message was from University management, warning us of the implications of taking strike action).