Comment by joshvm

We've had this for years with Waitrose, who just give you a scanner that you can take round the store. I think more recently they let you do it on the phone. Then you just pay at a special checkout and leave. They also have no-scale checkouts where you scan and leave (these are still attended). Usually if you buy something very expensive it'll flag up for a "random" check which always happens to be the expensive item.

The handheld scanners are easy to use. All it has is a trigger for scanning (which everyone knows how to do), scroll buttons, and a delete button if you make a mistake.