Cookie Compliance with OneTrust: A Practical Guide for UK Businesses
Cookies and similar technologies help websites remember preferences, understand how visitors use their pages and deliver relevant advertising. But they can also collect information about people, so businesses need to manage them in line with applicable privacy and electronic communications rules.
OneTrust provides consent management tools that can help organisations identify cookies, present choices to visitors and maintain records of consent. However, using a platform does not automatically make a website compliant. The configuration, wording and ongoing management all matter.
What does cookie compliance involve?
In the UK, the use of cookies and similar technologies is principally covered by the Privacy and Electronic Communications Regulations (PECR). Where information collected through these technologies is personal data, UK data protection law may also apply.
In general, visitors must receive clear information about non-essential cookies and be given a genuine choice before those cookies are stored or accessed on their device. Strictly necessary cookies may be treated differently, but the exemption is limited: a cookie is not “strictly necessary” simply because it is useful to the organisation.
For example, cookies that keep items in a shopping basket or support a service specifically requested by a visitor may qualify as necessary. Analytics, personalisation and advertising cookies will generally require consent unless a specific exemption applies. Businesses should assess each technology and its purpose rather than relying on broad labels.
How OneTrust can support cookie compliance
OneTrust’s consent management platform can help businesses manage several parts of the cookie compliance process. Depending on the product and configuration, this may include:
- Cookie discovery: scanning a website to identify cookies and similar technologies in use.
- Cookie categorisation: organising technologies into groups, such as necessary, functional, analytics and advertising.
- Consent banners: displaying a notice that explains cookie use and offers visitors appropriate choices.
- Preference centres: allowing visitors to review and change their cookie preferences.
- Consent records: recording choices and related information to support accountability.
- Tag and script controls: helping prevent selected technologies from running until the required consent has been given.
These features can make consent management easier to operate, especially for organisations with multiple websites or a large number of marketing and analytics tools. Their effectiveness depends on accurate setup and regular review.
Setting up OneTrust for a UK website
Find out what your website uses
Begin by reviewing cookies, tags, pixels, plug-ins and other technologies used across your site. Automated scans can help, but they may not identify every technology or explain its purpose correctly. Check the results against your content management system, tag manager, analytics platform and advertising tools.
Categorise technologies accurately
Classify each item according to what it does and why it is used. Avoid placing a technology in the necessary category merely to ensure it loads. If a cookie has several purposes, assess those purposes carefully and consider whether separate controls are needed.
Write a clear notice
Your banner should explain, in straightforward language, that the site uses cookies and provide an accessible route to more information. Visitors should be able to understand their options without having to search through lengthy or confusing text.
Offer a meaningful choice
Where consent is required, visitors should be able to accept or reject non-essential cookies with comparable ease. The design should not steer people towards accepting through prominent colours, confusing button labels or repeated prompts. Consent should be given through a clear affirmative action, rather than assumed from continued browsing or pre-selected settings.
Ensure preferences are respected
Configure the consent tool and connected tags so that non-essential cookies and similar technologies do not run before the necessary consent is obtained. Test the site in different browsers and on mobile devices. Check that rejecting cookies works, that preferences persist as intended and that visitors can change or withdraw their choice later.
Keep your cookie information up to date
Publish a cookie notice or policy that explains the technologies used, their purposes, relevant providers and how visitors can manage their choices. Review it when the website changes, when new vendors are added and after significant updates to your analytics or advertising setup.
Common mistakes to avoid
- Assuming that installing OneTrust alone makes a website compliant.
- Relying on an automated scan without checking its results.
- Calling analytics or advertising cookies strictly necessary without a proper assessment.
- Loading non-essential scripts before a visitor has made a choice.
- Making rejection harder than acceptance.
- Failing to provide a simple way to revisit or withdraw consent.
- Forgetting to check cookies set by embedded videos, social media tools and third-party plug-ins.
Ongoing checks are essential
Cookie compliance is not a one-off task. Websites change frequently, and a new plug-in, campaign or analytics feature can introduce additional technologies. Schedule regular scans and manual checks, review consent settings after releases, and make sure teams responsible for marketing and development know the process for adding new tools.
It is also important to consider how consent choices interact with connected services, such as tag managers and advertising platforms. Technical integrations should be tested rather than assumed to work correctly.
Choosing and configuring a consent management platform
OneTrust can provide a structured way to manage cookie notices and visitor preferences, but organisations remain responsible for deciding which technologies they use and how those technologies are configured. A carefully maintained consent platform can support a compliant approach; it cannot replace a clear understanding of the website’s data practices or appropriate legal advice where needed.
For UK businesses, the strongest approach combines accurate cookie discovery, clear information, a fair choice, reliable technical blocking and regular review. OneTrust can help bring these activities together, provided it is configured to reflect the organisation’s actual website and obligations.
6 Tips for Cookie Compliance with OneTrust
- Use OneTrust to scan your site and identify cookies and trackers.
- Classify cookies by purpose and keep records up to date.
- Get consent before setting non-essential cookies.
- Make accept and reject options equally clear.
- Let visitors change or withdraw consent at any time.
- Review consent settings after site or vendor changes.
Use OneTrust to scan your site and identify cookies and trackers.
Use OneTrust to scan your website and identify the cookies and other tracking technologies it uses. Review the scan results carefully, as automated scans may not detect every tracker or correctly identify its purpose. Confirm where each cookie comes from, what information it collects and whether it is essential or requires consent. Repeat scans regularly, particularly after adding new features, plug-ins or marketing tools, so your cookie notice and consent settings remain accurate.
Classify cookies by purpose and keep records up to date.
Classify each cookie according to its actual purpose—such as strictly necessary, functional, analytics or advertising—rather than grouping them under broad or convenient labels. Accurate categorisation helps visitors make informed choices and ensures consent settings are applied appropriately. Keep your records up to date by reviewing cookie scans, checking new tags and third-party tools, and updating your OneTrust configuration and cookie notice whenever your website changes.
Get consent before setting non-essential cookies.
Before setting or accessing non-essential cookies, obtain the visitor’s consent. Configure OneTrust and any connected tag managers to hold back analytics, advertising and other non-essential technologies until the visitor makes an active choice. Make it just as easy to reject these cookies as to accept them, and ensure the site respects the visitor’s choice across pages and visits.
Make accept and reject options equally clear.
When configuring your OneTrust cookie banner, make the “Accept” and “Reject” options equally clear and easy to use. Give both buttons similar prominence, use straightforward wording and avoid design choices that steer visitors towards accepting non-essential cookies. A balanced choice helps people make an informed decision and supports a more transparent consent experience.
Let visitors change or withdraw consent at any time.
Give visitors an easy, ongoing way to change or withdraw their cookie consent—not just when they first arrive on your website. With OneTrust, you can provide a clearly visible link to the preference centre, where people can review their choices and update them whenever they wish. Make sure the change takes effect promptly, including stopping any non-essential cookies or tags that are no longer permitted. This supports a transparent experience and helps your organisation meet its consent obligations.
Review consent settings after site or vendor changes.
Review consent settings whenever your website or its vendors change. A new plug-in, analytics tool, advertising partner or site update may introduce cookies or similar technologies that are not covered by your existing settings. Re-scan and test the site, check that each technology is correctly categorised, and confirm that non-essential cookies remain blocked until visitors have given consent. Update your cookie notice and preference centre where needed, so the information visitors see reflects what the site actually does.
