Who is top of the supermarket loyalty league?

Which of the big supermarkets has taken the title as the one that inspires most loyalty? Surely Tesco must be in with a shout - given that it commands 30% of the nation's supermarket shopping. Or how about Asda, the nation's number two supermarket - serving over 18 million of us? Or Waitrose, Britain's fastest-growing supermarket (with sales up 4.8% this year)?

No... they were all beaten by a budget superstar.
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