@Real Music,
We have another system too. As well as the self service checkout you can take an electric reader with you and scan your shopping as you go along.
At the end you use it to pay, no checkout nothing. I don't use it because it’s tied to the loyalty card, but I use the self check out all the time.
Although it normally can’t be used for big shops. Many stores don’t allow trollies to use it, only baskets.