@jonny I'm curious how this works per customer?
How do they connect the price displayed to the customer, and what if it change etc?
In UK we don't have digital prices tags afaik. Maybe the price is "displayed" on a customer price scanner? We have those but they are not common. I suspect people don't used them where they are optional and I'm not sure they are allowed in law to not display prices on the shelves.
I know that you can insist they honour the price on a shelf even if wrong.
@jonny I've managed to bag a trolley full of nicely priced decent wine in the past.