Fortunately they hold the charge for realistically short time and therefore are limited in use.

Our family was looking for a newer car. We found a listing for a VW, went to the dealership with intent to buy and was told that the car (which was standing RIGHT there) was available for sale in 3 months. Now we enjoy our new Toyota.

This is different. It’s a EU gov app that gives your website a zero-knowledge proof of age. Basically the only info they get is a “yes” or maybe the age itself. This is much better than what you describe, but I’m not familiar with the way the UK system works today.

I found this: The EU launches an online age verification app. Pilot project in five Member States (including Italy)