Marks and Spencer's Champs Elysees store sells more chicken tikka masala than any branch in the UK and the fifth highest number of BLT sandwiches.

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Retailers participating in the new SingleTap experience include: American Eagle Outfitters, Bloomingdale's, Champs Sports, The Container Store, Duane Reade, Einstein Bros.

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Naturally, being a French company, the biggest store in the world is on the Champs Elysee in Paris.

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