How Edwina Dunn and Clive Humby launched the Clubcard

Edwina Dunn and Clive Humby's Clubcard customer loyalty scheme helped secure Tesco's dominance for years.

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Edwina Dunn and Clive Humby Dunnhumby

Most retailers from your supermarket to your local coffee shop now run some sort of loyalty scheme whereby they collect data on you and your shopping habits in return for a small discount. The practice is so widespread now that it's amazing to think that as late as the mid-1990s the idea was seen as revolutionary. The couple most responsible for bringing the concept into the mainstream are husband-and-wife team Edwina Dunn, 57, and Clive Humby, 60.

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