One thing people underestimate is how brittle digital identity actually is in the UK.

There isnt a single identity. Theres a loose federation of databases (banks, CRAs, telecoms, electoral roll, etc.).

There are multiple operational definitions of "name": legal name, common name, known-as name, card name, account display name. None is universally canonical. Theres no statutory hierarchy that forces institutions to agree on precedence.

In the absence of a mandatory national ID, identification relies on matching across name, date of birth, and address history, which are inconsistently collected. Fuzziness is necessary for coverage, but it introduces brittleness. If a variant isnt explicitly linked as an alias, automated online checks can fail because the matching rules dont explore every permutation.

Even within a single dataset the problem doesnt disappear. Large systems such as the NHS have documented identification errors involving patients with identical names, twins at the same address, or demographic overlaps. Unique identifiers help, but operational workflows still depend on humans entering and reconciling imperfect data.

https://digital.nhs.uk/services/personal-demographics-servic...

Splink is a notable endeavor in this regard from the MoJ.

https://github.com/moj-analytical-services/splink.