I've just received an invitiation from my local council to switch to
paperless billing.

The email contains:

My Title + Surname
My Postcode and House Number
My Account/Council Tax Reference Number
My Account key for logging in on-line

A link to the their site and of course my email address.

Armed with that information I can login, change my email address,
switch to paperless billing and see a summary of my details.

Seeing as Council tax is a key element in identity proof am I being
paranoid that the council have not followed best practice, and if they
haven't is there a good reference I can use if I point this out to
them?

--
AnthonyL