[nffc]

Funny that - when you're in your basket, the popup in the question mark next to Deliver by says:

Delivery Dates

All of our delivery dates are provided based upon our ability to ship the order to you on time. As indicated by the delivery method descriptions Priority Service Orders receive priority in our order of despatching your items, then Standard and then Super Saver.

You may see from time to time that Priority/Standard and Super Saver deliver by dates change, this change is driven by demand and the capacity of our despatch team. The date is only amended so that you can see when your order will be delivered to you by, if at the point of checkout you feel that the date given will not get the goods to you on time then you can decide at that point whether or not to proceed with checkout.

We feel that in the interests of Customer Service this is a better way of setting your expectation rather than letting you down on the actual delivery date.

Doesn't say anywhere it is not a guaranteed service!