I'm glad that you mentioned, SparklyKid, a shopper meticulously putting items in separate bags. In the Netherlands, and in Germany, lone shoppers put all their items, as they come down the checkout slope, straight into their trolley, not into their separate bags. They then pay, and wheel their trolley to one side, and only then do they put their items into separate bags, thus clearing the checkout for the next customer. Incidentally, that is why Lidl supermarkets have a long, wide shelf fixed next to the outside wall/window of the building. I sometimes wish that all our supermarkets could put a sign up to encourage lone shoppers to put it all in the trolley, and then move to one side.