UK Data Residency: Keeping Your Data in the UK
Data residency refers to the physical geographic location where data is stored and processed. Some organisations have legal, regulatory, or contractual requirements to keep data within the UK — or more broadly within the UK/EEA. Understanding what data residency means in practice is important for compliance and client assurance.
Why Data Residency Requirements Exist
- UK GDPR: International transfers of personal data outside the UK require appropriate safeguards (adequacy decision, standard contractual clauses, binding corporate rules). Keeping data in the UK eliminates this requirement.
- Regulated sectors: Financial services (FCA), healthcare (NHS), and public sector contracts frequently require UK data residency
- Client contracts: Enterprise clients may require UK data residency in their supplier contracts
- Government and defence: Official Sensitive and above data must remain in UK-based, approved infrastructure
Achieving UK Data Residency
- Primary storage in UK regions: All cloud providers offer UK regions. AWS: eu-west-2 (London). Azure: UK South, UK West. GCP: europe-west2 (London).
- Managed services must also be UK-hosted: Database services, caching, queues — all must be configured in UK regions
- CDN considerations: CDN edge nodes are global by design. For truly UK-only, CDN must be bypassed or configured to serve only from UK nodes (limits performance benefits).
- Third-party services: SaaS tools your application integrates with may process data outside the UK — each integration must be assessed