Asda are getting advance orders were they have 2 weeks notice of sales in their database but there is no stock allocation going on and they are taking this resource and throwing it over their left shoulder for luck, the order gets picked on the day of delivery and you get whats in stock on that day. The online ordering process is strange in that when you amend an order that is due for delivery in 9 days the current stock levels are checked and any items that are currently out of stock must be deleted from the order before the amends can be saved, which means you have to amend your order again the following day to put the items back on order that you were forced to remove yesterday while deleting the items that are out of stock today. There must be a better system than this