New one for me
incoming email:-
I can't imagine it really is a unique reference number in the subject, but I've redacted it anyway.
From: Council Tax - GOV. UK <kanri@fukuokadensetu.co.jp>
To: nuttycyclist's email address
Subject: GOV.UK - Reference: <redacted>/C31CTR-Number: <redacted> - COUNCILTAXGOVUK- Message on 24-May-2021 13:57:11 BST - Your GOV.UK important order <redacted> has been dispatched
No email body (I have my client set to plain text for this reason). On opening and reading the html attachment it appears that my house is in a new council tax band and as I have a low income I can claim a council tax reduction if I go to a strange URL which I'm not going to paste here for obvious reasons.