Just been to buy a tin of White paint from Wickes,and the price on the shelf said 6.49, and the price in the book said 6.49,so the checkout girl charged me 7.49.Then had the cheek to ask me to buy a raffle ticket for some footballers used shirt, to raise money for destitute shop staff or some such pointles thing.
So went to recheck price after i had paid by card,so back to checkout explained politely the problem,(forgot to explain that as she was not a banker,she had commited fraud, and obtained money illegally,and she could be sent to prison for fraud).
So just asked for a refund,which eventually i got.
So always check your receipt.