[emilfihlman]

>But, the UK government added a site so you can prove you're you, and get codes, which for a limited period show someone that yup, this person is legal to drive and so on.

Could you link us the site?

[Symbiote]

I think it is this: https://www.gov.uk/prove-right-to-work

(Just from a search, I've not needed to find this before.)