Id like an app where i can add my online accounts for Asda, Tesco, Iceland etc. Then i can add my items and it selects and adds the item to the cheapest store FOR THAT ITEM (I can overrule this). Then when I've finished I can purchase a delivery from a store, a click & collect or just leave it and go to store. Each supermarket list can have things added or deleted before purchase. So via Asda I could order £40+ for delivery, Iceland order £80+ and Morrisons £15 click & collect. The app could charge 5% for this service or a monthly charge.