Always check your receipt.

Last friday i did some quick shopping in Tesco Express. I bought 3 bottles of sunflower cooking oil under a special deal. I was charged 2 bottles extra which means 5 bottles.If i had not checked, i would have contributed £3.68 to either the pocket of the checkout girl or Britain's No1 Supermarket.

So always check your shopping receipts otherwise you will loss your hard-earned money.