The question in the title: What a regulator's shortage notice actually authorises — what changed since I will give what I have already checked below so nobody repeats it.
Asking what a regulator's document actually says, since the summaries of it disagree.
I have the primary document open and two secondhand accounts of it that cannot both be right. The primary document is narrower than either.
My question is whether I am reading the scope of it correctly, and what the correct reading rules out as well as what it permits.