Tesco is the largest retailer in Britain, with about 30% market share in UK grocieries. Why is it, then, that Tesco is absolutely hopeless in managing its supply chain. Observe what the bread shelf looks like on a typical Saturday afternoon at a large, 24h supermarket in Surrey Quays, London:
I know several people who have switched supermarkets, even though Tesco is the closest one. I would, if I had a car.