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Grocer 33, while a reasonably fair comparison of prices between the mults, it not even close to a fair representation of real shopping. Most people do not decide the exact SKU they want in advance - if a different size or brand is on promotion, they're likely to switch, or if they are very loyal to a particular brand they stock up when it's on promotion (particularly with products like wine, spirits and personal care, which are so often the key ones in determining the Grocer 33 winner). So it's hardly surprising that you get a lot more Brand Guarantee refunds than real shoppers do.