The General Data Protection Regulation (GDPR) was introduced in 2016 to protect personal information, including the use of strictly necessary cookies↗, and businesses must [ensure compliance with both UK GDPR and EU GDPR](https://pii.ai/sensitive-data/how-to-ensure-that-your-business-is-gdpr-compliant↗) to operate legally and avoid fines↗. GDPR first started in the EU, but since Brexit was finalized in 2020, the UK adopted GDPR completely into its own legislature with some slight changes. The UK also has another regulation called the Data Protection Act (DPA) of 2018, which essentially adapts GDPR laws for the UK legal environment before UK GDPR existed. The differences between the two GDPRs are listed below so you don't get caught off guard.
National Institutions
In the UK GDPR, the UK government replaced references to institutions such as the European Parliament with their UK counterparts. The new enforcer of the regulations is the Information Commissioner’s Office (ICO) instead of the European Data Protection Board. This has little effect on businesses and consumers, other than being aware of who oversees compliance.
Age of Consent
In the EU, the age of consent under GDPR is 16 years old, while the UK has changed this to 13 years old. Businesses must be wary of this since it will affect the flow of personal information of those between the ages of 13 and 16 from the UK to the EU.
Expanded Scope
Because the EU is extra-national, its scope didn't cover all areas of national concern. The UK GDPR is expanded to cover the areas of intelligence services, immigration, and national security services, allowing personal information protections to be bypassed in matters pertaining to these areas. All entities processing and storing personal information must comply with such requests.
Conclusion
Thankfully, the UK's privacy laws are deemed "adequate" by the EU, allowing a free flow of personal data between the two areas.
How the Age of Consent Difference Affects Your Customer Data
If your eCommerce brand sells across the UK and EU, the 13-year-old consent threshold in the UK creates a real operational challenge. In the EU, you cannot legally process data from anyone under 16 without parental consent. In the UK, that drops to 13.
This matters most if you're running marketing campaigns, collecting email addresses for newsletters, or using analytics tools like Google Analytics or Meta Pixel. A 14-year-old customer in Manchester can legally consent to their own data processing. That same customer crossing the digital border into the EU marketplace cannot—you'd need a parent or guardian to consent instead.
For your Shopify or BigCommerce store, this means your consent workflows need to be geography-aware. You can't use a one-size-fits-all approach. If a customer's IP address or billing address flags them as UK-based, your cookie banner and sign-up forms should reflect the lower age threshold. For EU visitors, you need stricter parental consent mechanisms.
The practical impact: you'll likely need two different consent flows built into your cookie management platform. Test this thoroughly before you launch cross-border campaigns. If you're using third-party tools like Klaviyo for email marketing, verify that the platform itself respects these regional age differences—many don't by default, and the responsibility still lands on you.
Data Subject Access Requests (DSARs): Different Timelines, Same Obligation
Both the UK and EU require you to honor Data Subject Access Requests, but the procedural differences can trip up growing eCommerce teams.
In the EU, you have 30 days to respond to a DSAR. In the UK under UK GDPR, you also have 30 days—so here, the rules align. However, both regulators allow for a single 30-day extension if the request is complex or you receive a high volume of requests.
The real difference emerges in how you handle requests operationally. The ICO (UK) has published specific guidance on what constitutes "reasonable" effort in locating customer data across your systems. The European Data Protection Board's guidance is slightly more flexible. If you're storing customer records in multiple systems—Shopify's native database, your email marketing platform, your customer service tool, and your payment processor—you need a clear audit trail showing where data lives and how you compiled the response.
For your brand, build a DSAR response template now, before you need it. Document the exact systems you query (product purchase history in Shopify, email engagement in Klaviyo, payment records in Stripe, etc.). Create a checklist of data types: names, email addresses, purchase history, browsing behavior from Google Analytics, interaction data from Meta Pixel, and anything else you collect.
The ICO and EU regulators both expect transparency in your response. If you can't find certain data or it's encrypted in a way that makes retrieval impractical, you must still explain this clearly to the customer. Vague responses lead to enforcement action—and fines.
Cookie Banners and Consent: Regional Requirements You Can't Ignore
Your cookie banner isn't just a legal checkbox. It's a compliance control, and the UK and EU have subtly different expectations about what "valid consent" looks like in practice.
The EU requires that consent be freely given, specific, informed, and unambiguous. Your cookie banner must use plain language and avoid dark patterns (like pre-checked boxes or confusing button text). The UK follows the same principles but adds emphasis on transparency about the controller's identity and purposes.
Both regions require you to distinguish strictly necessary cookies from optional ones. Strictly necessary cookies (login sessions, anti-fraud checks, cart functionality) don't need consent. Everything else does. But here's where eCommerce brands often slip up: many third-party tools bundled into Shopify themes—Facebook Pixel, Google Analytics, Hotjar—are not strictly necessary. They require explicit opt-in.
Your cookie banner platform must be capable of:
- Listing each cookie or tracker by name and purpose
- Allowing granular consent (customers accept analytics but reject marketing retargeting)
- Recording when and how consent was given
- Respecting withdrawal of consent in real time
If you're using a basic free banner, you're likely not meeting these standards. Both the ICO and EU regulators have increased enforcement scrutiny on cookie compliance. Document which tools you use and what data they collect. Update your banner whenever you add a new integration or marketing tool.
International Data Transfers: When UK and EU Rules Diverge Most
If you're a UK-based eCommerce brand serving EU customers, or vice versa, you need a data transfer mechanism in place. The EU-UK Trade and Cooperation Agreement allows data to flow freely as long as the UK maintains "adequate" privacy protection—which it does, for now. But that adequacy status isn't permanent, and it doesn't cover all scenarios.
The challenge: if you store customer data on servers in the United States (common for Shopify stores), you need additional legal agreements beyond GDPR. Standard Contractual Clauses (SCCs) are the current mechanism approved by both the ICO and EU authorities. Without them, transferring EU or UK customer data to a US-based vendor violates both regulations.
For your Shopify store, check where Shopify itself stores your customer data. Verify that your payment processor, email marketing tool, and any analytics platform have signed data processing agreements with you and have adequate transfer mechanisms in place. When you onboard a new vendor, this is a compliance requirement, not optional.