Well, there you go. Just got an email from Amazon. The important bit:
"Normally, in this situation, I'd create a replacement order for the missing item right away, to be sent to you as soon as possible at no additional charge.
Unfortunately, at the moment, "Kenwood Prospero Compact KM265 4.3 Litre Stand Mixer" is unavailable from our suppliers and we can't send a replacement. Although the item might be available on our website from third party sellers, we can't source items from them. However, we'll be happy to issue a full refund for this order.
In this case as you do not have a box to return the item, what I can do for you is give a 15% discount for your item. "
OK 