My name is Michael Murphy and I represent Executive Customer Relations within Amazon.co.uk. One of our mandates is to address the most acute account and order problems, and in this capacity your account and orders have been brought to my attention.
We have found your account is directly related to another which has been previously closed for abuse of our policies. As such, your Amazon.co.uk account has been closed and any open orders have been cancelled.
Basically, Amazon can ban you for any reason and not tell you why. When this happens all your books that you paid for are GONE. Investing in a service that can instantly block you from the goods you have purchased is never a smart move.