Krispy Kreme is giving away thousands of free doughnuts for one day only this week

KRISPY Kreme is running a “part exchange” programme where customers can swap a half-eaten doughnut for a new one.

The iconic chain will upgrade partially-munched treats from rival brands in order to weed out “dupes” of its Original Glazed product.

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Experts will be on hand in stores to “verify” the dupes...