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Online food shopping: What is a 'dark' supermarket?

17 January 2014 Last updated at 09:50 GMT

On the High Street, the big supermarkets are diversifying - both Sainsbury's and Tesco now have more smaller sized convenience stores than larger, traditional supermarkets.

An increasing number of people are also shopping online.

Tim Muffett reports from a 'dark' store.

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