UK GUIDE · UPDATED AUGUST 2026
Google Consent Mode v2 for UK Websites
Google Consent Mode v2 helps websites communicate visitor consent choices to Google Analytics 4, Google Ads and Google Tag Manager. It can support privacy-aware measurement, but it does not replace a cookie banner, consent management platform or proper technical setup.
This 2026 guide explains the four main consent signals, the difference between Basic and Advanced Consent Mode, how Consent Mode should connect with a cookie banner, what changed for UK analytics in 2026, and how to test whether your implementation is actually working.
Last reviewed: August 2026 · Practical website guidance only. Not legal advice or formal compliance certification.
What Is Google Consent Mode v2?
Google Consent Mode is a technical framework that lets supported Google tags adjust their behaviour according to a visitor’s consent choices. Your cookie banner or consent platform collects the choice; Consent Mode communicates the relevant consent state to Google.
The important point: Consent Mode is not the consent mechanism itself. A website can display a polished cookie banner while its Google tags are still configured incorrectly behind the scenes.
Your Banner Collects the Choice
The visitor accepts, rejects or selects individual categories through your cookie banner or consent management platform.
Consent Mode Sends the State
The relevant Google consent signals are updated to granted or denied according to the visitor’s decision.
Google Tags Respond
Supported Google tags change their behaviour according to the consent state and whether Basic or Advanced Consent Mode is used.
Basic vs Advanced Consent Mode
Basic and Advanced Consent Mode are not interchangeable. The difference matters because Google tags behave differently before consent is granted.
Basic Consent Mode
With Basic Consent Mode, Google tags are blocked before the visitor interacts with the consent mechanism. If the relevant consent is not granted, those blocked tags do not send data to Google.
- Google tags are blocked before consent interaction.
- Tags load when the relevant consent is granted.
- Google describes more limited modelling compared with Advanced mode.
Advanced Consent Mode
With Advanced Consent Mode, Google tags can load while relevant consent states are denied. Google states that measurements without cookies may be sent, with behaviour changing if the visitor later grants consent.
- Google tags can load before consent is granted.
- Relevant consent states can remain denied.
- Measurements without cookies may be sent.
- Google describes more detailed modelling where eligibility requirements are met.
Important: Advanced Does Not Mean “Automatically Compliant”
Advanced Consent Mode is a technical implementation choice. It does not itself create a PECR exemption, determine your UK GDPR position or certify that your website is compliant. The correct approach depends on what your website stores or accesses, the purposes involved, the information given to users and the wider configuration.
The Four Main Consent Mode v2 Signals
These four consent types are particularly important for websites using Google Analytics and Google advertising products.
analytics_storage
Controls consent for storage associated with analytics, including analytics cookies and identifiers used by supported Google measurement products.
ad_storage
Controls storage associated with advertising, including advertising cookies and identifiers used for ad-related functions.
ad_user_data
Communicates whether consent has been given for sending user data to Google for online advertising purposes.
ad_personalization
Communicates consent for personalised advertising, including remarketing and other advertising personalisation features.
Consent Mode and UK Cookie Rules in 2026
The ICO published final Storage and Access Technologies guidance in April 2026 following changes introduced by the Data (Use and Access) Act. One important change is a limited exception for certain statistical purposes.
What Changed?
In certain circumstances, storage or access used solely to collect statistical information about how a service is used, with a view to improving that service, may fall within the new statistical-purposes exception.
What It Does Not Mean
It is not a blanket exemption for every Google Analytics or GA4 configuration. Advertising, profiling, cross-service tracking and uses outside the statistical purpose can still require consent.
The ICO sets conditions around the purpose, the information provided to users and giving people a simple and free way to object. Website owners should therefore avoid assuming that “analytics” automatically means “consent-free”.
For a deeper explanation, see our Google Analytics Cookie Consent UK guide and GDPR vs PECR Cookies UK guide.
Why Consent Mode v2 Matters
Many UK websites rely on Google Analytics, Google Ads and Google Tag Manager for traffic measurement, advertising attribution and conversion tracking. Consent Mode helps those products receive consent information so their behaviour can adjust according to a visitor’s choices.
The practical issue is not simply whether Consent Mode is “installed”. The important question is whether your banner, consent platform and Google tags all reflect the same choice at the right time.
A technically weak implementation can create a mismatch between what the visitor sees and what the website actually does.
How Consent Mode v2 Should Be Set Up
The exact implementation depends on your website, cookie banner, consent management platform, Google Tag Manager configuration and advertising setup. The aim is to make sure the consent state is established early enough and then updated accurately when the visitor makes or changes a choice.
Step One: Identify the Google Tags
Confirm whether the website uses GA4, Google Ads, remarketing, Conversion Linker, GTM, Floodlight or other Google measurement and advertising features.
Step Two: Set the Default State
Establish the intended default consent state before dependent Google tag behaviour. The setup should reflect your chosen Basic or Advanced implementation.
Step Three: Update After Choice
When the visitor accepts, rejects or changes a category, update the relevant consent signals so the Google-tag setup reflects the real choice.
How to Test Consent Mode v2
Do not test only by clicking “Accept all”. The most revealing checks are often what happens before any choice, after rejection and after a visitor later changes their preferences.
Before Any Choice
Open a fresh private session. Check the earliest consent state, whether Google tags load, what cookies or storage appear and what network requests occur before the visitor interacts with the banner.
After Rejection
Reject optional categories and confirm that the relevant Consent Mode parameters remain denied. Check that the banner, CMP and tag behaviour all reflect the same decision.
After Acceptance
Accept the relevant categories and confirm the expected consent updates. If Analytics and Marketing are separate choices, test them separately rather than treating all consent as one switch.
Useful tools include Google Tag Assistant, GTM Preview, browser developer tools, the Network panel, cookie/storage inspection and your CMP’s own debug features.
Google Consent Mode v2 Checklist
Use this practical checklist to review the connection between your cookie banner, Consent Mode and Google-tag behaviour.
- Identify GA4, Google Ads, GTM and other Google tags.
- Confirm whether Basic or Advanced Consent Mode is intended.
- Check the earliest/default consent state.
- Check
analytics_storage. - Check
ad_storage. - Check
ad_user_data. - Check
ad_personalization.
- Test the site before making any choice.
- Test Reject.
- Test Accept.
- Test granular Analytics and Marketing choices.
- Test withdrawal or a later change of consent.
- Look for duplicate Google tags.
- Compare actual tag behaviour with the wording in your cookie policy.
Common Consent Mode v2 Mistakes
Most problems are not caused by the idea of Consent Mode itself. They come from timing, duplicate tags, disconnected banners or assumptions about what the implementation is actually doing.
Default State Set Too Late
The website may begin processing measurement or advertising activity before the intended consent state is established.
Banner Not Connected
The visitor clicks Reject, but the Google consent state does not update correctly or a later page load restores a different state.
Duplicate Google Tags
GA4 or Google Ads may be installed through GTM, a WordPress plugin, an ecommerce integration and hard-coded scripts at the same time.
Advertising Signals Missed
Older setups may focus on analytics_storage and ad_storage but fail to review ad_user_data and ad_personalization.
Only “Accept All” Is Tested
The no-choice, Reject, granular-choice and withdrawal states often reveal issues that are invisible when only the accepted state is checked.
The 2026 Exception Is Over-Applied
The statistical-purposes exception does not automatically make every analytics, advertising or tracking setup consent-free.
Need a Practical Consent Mode Review?
A cookie banner can look correct while Google Analytics 4, Google Ads or Google Tag Manager still behave differently behind it. Our Google Consent Mode Audit UK reviews the public consent journey, visible Google-tag behaviour and practical points for your developer, PPC agency or marketing team to investigate.
- Consent Mode signals and default states
- Behaviour before a visitor makes a choice
- Reject and Accept behaviour
- GA4, Google Ads and GTM observations
- Possible duplicate tags
- Practical technical questions for your developer or agency
The audit is not legal advice, formal certification or a substitute for direct access to your CMP, GTM container, analytics property, advertising account or website code.
Google Consent Mode v2 FAQs
Does Google Consent Mode v2 replace a cookie banner?
No. Consent Mode communicates consent status to supported Google tags. It does not provide the cookie banner or consent controls used to collect a visitor’s choice.
What is the difference between Basic and Advanced Consent Mode?
Basic mode blocks Google tags before consent interaction. Advanced mode allows Google tags to load with relevant consent states denied and can send measurements without cookies until the visitor changes their choice.
What are the four main Consent Mode v2 signals?
The four most commonly relevant signals are analytics_storage, ad_storage, ad_user_data and ad_personalization.
Do UK websites still need consent for analytics in 2026?
Not every analytics implementation now has the same answer. A limited statistical-purposes exception exists, but it has conditions and does not cover wider advertising, profiling or tracking uses.
Does the statistical-purposes exception automatically apply to GA4?
No. Whether the exception is relevant depends on the purpose, configuration and use of the information. A website should not assume that installing GA4 automatically qualifies.
How do I know if Consent Mode is working?
Test the website before any choice, after Reject, after Accept and after changing or withdrawing consent. Check the actual Google consent states, cookies, storage and network behaviour rather than relying only on the banner appearance.
Official Guidance and Platform Sources
Consent Mode and UK storage-and-access rules continue to develop. For primary-source information, refer to the current official guidance from Google and the ICO.
Related Cookie Banner Guides
Continue with practical UK guidance on analytics consent, tracking pixels, cookie rules and platform-specific checks.
Need Help Reviewing Your Consent Mode v2 Setup?
Download the free checklist to work through the basics, or see how a practical Google Consent Mode Audit can help your developer, PPC agency or marketing team investigate your consent journey, GA4, Google Ads, GTM and visible tracking behaviour.
This is practical website guidance only and is not legal advice or formal compliance certification.