Shoppers make thousands from Asda glitch

Sarah Coles
Abby Clancy in Asda for a previous promotion
Abby Clancy in Asda for a previous promotion

Matt Crossick/PA Archive/Press Association Images

Asda's Price Guarantee has backfired, after a glitch in the system meant it started doing incorrect price comparisons and refunding a small fortune. Some customers claim to have made thousands of pounds.

So what happened, and can you cash in?
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