Ok, now these are impressive. I was at the Kiddicare store in Thurrock, Essex and I noticed that the shelf tags looked quite a bit different to the card barcode things you normally get in a superstore or shop.
I looked a bit closer at these tags and was pretty sure they were LCD displays with some sort of stock count thing going on. While closely inspecting a shelf tag a store worker came along with a bar-code reader device and so I asked if the tags were LCD.
I also asked if they were radio controlled with real time stock updates.
YES! The stock tags update every five minutes.
I was so impressed with this use of tech that I nearly forgot what I went into the shop to buy. I have seen the future, and it will be.