Tesco, Sainsbury's Make Millions Off Loyalty Card Data: Times - Bloomberg

Tesco Plc and J Sainsbury’s Plc, two of the biggest UK supermarkets, make about £300 million ($376 million) a year from selling information about their customers’ shopping preferences, the Times reported.

The supermarkets' next big product is your data

Tesco seeks ingredient to be Britain's best-loved grocer again

Inflation Hits Loyalty Cards as Tesco, Sainsbury Ramp Up Promotions - Bloomberg

Look Out, U.S Grocers, U.K.'s Free-for-All Heads Across the Pond - WSJ

Tesco Isn't Such a Loser in the Big Sainsbury-Asda Deal: Gadfly - BNN Bloomberg

Tesco, M&S, Sainsbury's: UK supermarkets braced for post-Christmas price war escalation

Simon Rowles Institutional Bank Presentation July 2014

Tesco and Sainsbury's using 'dodgy tactics' on promotions, says Which?

Tesco and Sainsbury's providing 'misleading' loyalty card prices, says Which?

How the UK's 'Big Four' Supermarkets Perform for Customer Service on Twitter, by Dean McCann, HelpHandles™ Insight Series

Are loyalty cards really worth it?, Supermarkets

Supermarkets' Loyalty Cards Come Under Scrutiny: The London Rush - BNN Bloomberg

Retail Disruptors: The by Steenkamp, Jan-Benedict

Sainsbury's and Tesco make £300M from YOUR data in 'loyalty schemes'