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Our Tesco seemed to have a permanent queue and at least by being there before it opened and at a reasonable place in the queue, you could be sure of getting in right away whereas later on it's waiting for x amount of people to come out before they let same amount in and sometimes the person in charge would disappear and not be in control of the situation. Also in the early days if you were after eggs, flour or pasta, it was helpful to get in early.