Tesco Asda, Sainsbury's, Morrisons Christmas delivery slots

Why do I need to choose a slot before I place my online groceries sainsburys delivery slot Customers who book a same-day delivery before midday can choose a delivery slot after 5pm or click-and-collect spot after 4pm Advertisement sainsburys book a slot A Delivery Pass can only be used for Sainsbury's Online Groceries, and not any Non-Food orders Slot Options Unlike many of the supermarkets,

sainsburys delivery slot I thought I'd double check the Sainsburys app just incase any slots had opened up Right there, in-front of me, was a morning delivery slot