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Alphabetical Index 2 (AI2): GDPR information


Why and how we process your data in the Alphabetical Index 2 (AI2) and your rights.

Controller NHS Digital
How we use the information (processing activities)

Holding this list so that records can be traced and verified when queries are resolved about data held in the Personal Demographics Service (PDS) and to process National Back Office (NBO) tracing requests.

Does this contain sensitive (special category) data such as health information? No
Who are recipients of this data?


Is data transferred outside the UK? No
How long the data is kept 20 years minimum from no longer required
Our lawful basis for holding this data Legal obligation
Your rights
  • Tick Be informed
  • Tick Get access to it
  • Tick Rectify or change it
  • Cross Erase or remove it
  • Tick Restrict or stop processing it
  • Cross Move, copy or transfer it
  • Cross Object to it being processed or used
  • Cross Know if a decision was made by a computer rather than a person
How can you withdraw your consent?

Consent not the basis for processing

Is the data subject to decisions made solely by computers? (automated decision making) No
Where does this data come from? National Registration Offices, Health Authorities, General Register Office.
The legal basis for collecting this data

Legal obligation (Commencement Order)

Where NHS Digital uses this data


National Back Office for the Personal Demographics Service

The National Back Office (NBO) provides a national data quality service. It's responsible for the management of NHS Numbers and PDS records, investigation and resolution of data quality incidents on Personal Demographics Service (PDS) demographic records, and the provision of a Tracing Service to approved organisations.