Universal Credit tells us all we need to know.
Bearing in mind this system has to contain everyone in the UK.
Also notice what DOGE did when they had access to the entire US social security database. That's a fucktonne of extremely valuable marketing data right there.
You can see it now.
2025: We will never allow anyone access to the UK ID database.
2027: We well never allow unauthorised access to the UK ID database
2029: The UK ID database is covered by the strongest protections
2031: Only selected UK government partners are allowed access to the UK ID database
2025: Email from Tescos saying "We noticed your children are now nearly 18.Have you thought about getting them a Tesco online account".
and so on.