UK GDPR Data Residency — AWS & Azure UK Regions, International Transfers (2025)

Data residency refers to the physical location where data is stored. Data sovereignty refers to the legal jurisdiction that governs the data. They overlap but are not identical. UK GDPR requires that transfers outside the UK have adequate protections — using a UK data centre (residency) is the simplest way to achieve this, but the legal jurisdiction (sovereignty) of the cloud provider and its parent company is also relevant. AWS and Microsoft are US companies — even when you use UK regions, US laws (like CLOUD Act) may apply to their US parent companies.

The UK-US Data Bridge (formally the UK Extension to the EU-US Data Privacy Framework) allows UK organisations to transfer personal data to US organisations that have self-certified under the framework. It was established in October 2023. Not all US companies have self-certified — check the Data Privacy Framework participant list before relying on this mechanism. Key participants: AWS, Google, Microsoft, Salesforce, Stripe.

The EU-UK adequacy decision (which allows EU-to-UK transfers without additional safeguards) was due for renewal in 2025. If it lapses, EU organisations could no longer freely transfer personal data to UK organisations without SCCs or BCRs. UK organisations building for EU customers should build "dual compliance" into their architecture — supporting both UK GDPR and EU GDPR simultaneously, which ClickMasters recommends for all UK-based SaaS platforms targeting EU markets.

Yes — UK GDPR applies based on where your users are (UK residents) and where your business is established (UK), not where the data is stored. Storing data in AWS eu-west-2 means the data is physically in the UK and there is no international transfer issue — but UK GDPR still governs how you process, retain, secure, and provide rights over that data.