How do they do it?

Yesterday evening I ordered something from Next online.

I got an email saying it’d be ready after 2pm the next day from my local store.  I was amazed.  How do they achieve this?

This morning I got a text just before 11am saying that the item I’d ordered was ready for collection.  How is this possible?

The item I’d ordered isn’t normally stocked by our local store so it would have travelled from a distribution centre.  

Surely one item can’t have been worth the logistical cost.  Let’s assume that a few items were delivered and let’s assume one van or truck delivers to a few stores, can the cost of the vehicle, fuel and the cost of the driver really justify this, on a Sunday?

Or are deliveries happening seven days a week to all stores and my item was just chucked on the van before it left this morning?  This seems fairly logical but I am surprised all stores receive deliveries that frequently, and that all deliveries happen by 2pm.

Anyone out there know how they do it?