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Thanks for the replies. I believe B & Q offer a no quibble refunds guarantee so I would expect them to honour that and not exclude me arbitrarily especially as I brought the goods back promptly the next day. The amounts matched exactly. The only thing that did not match was the product code, the amounts were there alright as were the last 4 digits of my switch card. Everything matched except the product codes for those three packets. Something scanned wrong but I can't understand how! I used to work for a manufacturer. Our clients, the retailers, regularly sent us back goods that individuals had taken back to the shop, often for spurious reasons, like they had changed their minds. I used to get really annoyed about that. But where a shop offers no quibble refunds, I would expect them to honour that. Where it's a small independent one outlet retailer it's a different matter of course.