[astonex]

You don't currently have any National ID. You have forms of ID, which others might not have, but none are national mandatory ID that every citizen and resident has. As such many benefits in streamlining and simplifying processes cannot be achieved when everyone has a UID as such. Imagine making a system where you used various ID formats, and you couldn't guarantee anyone had one in particular, and some people had none.

Your NI card literally says it's not identification. A NI number is not linked to a passport as it's not mandatory to have a passport, so that would not work for many people. It is just a number used for tax accounting.

[matt-p]

Ok then 'Government issued [photo] ID' so what if it's not a 'national ID'? They have all the data they need to tackle this. You can't get a NI number without proving who you are, if the government don't trust NI numbers (which they are minting?) then they could simply re-issue them? That would be far far easier than a new national ID.

[astonex]

>You can't get a NI number without proving who you are

That's not true either. You're sent your NI number just before 16 years old without providing anything.

Also, an NI number is just a number. There is no photo. How can you look at it and say it belongs to the person presenting it? And no you can't look up a passport or something in another system based on the NI number, because those other IDs aren't mandatory so the person might not have them.

The only way to really ID someone is to have mandatory photo ID, whether that be digital or not.