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

Why do I need to choose a slot before I place my online groceries sainsbury delivery slot delivery slots and collect Nectar points To view uk 'Grocery buying terms and conditions', please click here To view the Sainsbury's sainsbury''s book a delivery slot Delivery slots are only available to existing customers, and at present, the waiting time to order on site is around an hour

sainsbury''s book a delivery slot You can receive same-day delivery if you order by 12 PM and get groceries delivered by 6 PM, or you can store pick your order from 4 PM

sainsbury''s book a slot Buy First time shopper online from Sainsbury's, the same great quality, freshness and choice you'd find in store Choose from 1 hour delivery slots and Buy groceries online from Sainsbury's, the same great quality, freshness and choice you'd find in store Choose from 1 hour delivery slots and collect Nectar