The UK already has (various) digital IDs but this is the 'new' one https://www.gov.uk/using-your-gov-uk-one-login . So what's going to be different? Just making it mandatory? I can see some justification (sorta) for not making it mandatory, but saying it won't improve citizens lives is complete rubbish. Having one login for all government services would massively improve the efficiency, especially if other department…
Each service would issue you a different one.
It's not so bad now, but it's extremely irritating to have a number as the user id as when you run a business or two, you end up with more, and then you have no idea which is which.