I was one who did not check my reciept untill ,i found that i had been charged twice for 2 different items on my reciept,i went back to sainsburys with my reciept to point this out and also asked,how come the item was charged again after another item went thro the till,and sarcasticley said i didnt see it jump out of my bag and get back on the belt,to go through again ,the only explantion was i cant tell you how thats come about,although refunded on the two items how many more customers get charged twice even though youve already put the item in your bag,it makes you wonder.