This is an interesting development
rcxb and Miss_X2m1 have brought my attention to the fact that I too have been receiving so-called notifications apparently from Amazon of things waiting for me at my post office, with a helpful link to some page that is neither a Post Office site nor Amazon.
Of course, not being part of the numpties that click on links from unknown entities, I just controlled that the link was suspicious and trashed the mail forthwith.
Now, though, I have to wonder : is this part of the consequences of the breach-that-was-not-a-hack ? I live in France, so if it is, the problem is much larger than just the UK (since Miss_X2m1 is USA-based).