Why do I need to choose a slot before I place my online groceries

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Tesco and Sainsbury's offered us next-day delivery slots, while Asda was a two-day wait Ocado had no slots available for the next five days and

Discover Tesco online food shopping and great value groceries, plus earn Clubcard points Book a grocery delivery or Click+Collect slot now  slots You can select an available delivery slot by clicking Book Delivery A confirmation window will appear If you would like to book the slot you have

batman88 slot online I've been trying to book a delivery slot with Sainsbury's, every date from and including 9th August is showing as 'unavailable', it's been like Sainsbury's customers who have a Delivery Pass could book their Christmas food order from November 23 Other shoppers were able to secure a slot