So, a whole week later and mysteriously CPCW have decided to send me an email suggesting that they are now processing my order for free delivery for any day except Friday Dec 11th December. The email is timed at 03:01 12th December. D'oh!
Anyway, I have an order number but nothing else and the order number is completely ignored by their own Track My Order process which is accessed by a button on the email. It goes to their website but entering details results in, well, a page reset.
The one useful bit of information is how I can return the item and if I paid by PayPal which I did, I can get a full refund.
Let's see how this one goes, eh?