McNamara says Tesco has been analysing customer data for "donkey's years", keeping every scrap of purchase ... there's an awful lot of noise and very little signal, and the cleverness comes ...

The radical transformation of Tescos fortunes from lacklustre number two to Britains largest retailer has been well documented. Between 1990 and 1999, Tescos turnover increased from 8bn to 17bn 1 and ...