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Security report for three.co.uk

Hutchison 3G UK Ltd (Three) · Telecommunications · United Kingdom

Low risk. 2 critical or high findings in GDPR outside view and SSL/TLS.

Security score

83/100

Risk levelLow

0–100, higher is better. How it is calculated

Three UK, operated by Hutchison 3G UK Ltd, is a major telecommunications provider in the United Kingdom offering mobile phones, tablets, mobile broadband, and SIM only deals primarily on the UK's fastest 5G network. The website presents a professional and consistent brand image aligned with a large enterprise in the telecom sector. The technical infrastructure is built on Adobe Experience Manager CMS with integrations for Google Tag Manager and Adobe Launch, indicating a mature digital marketing and analytics setup. Security posture is strong with HTTPS enforced and no obvious vulnerabilities detected, though security headers and vulnerability disclosure mechanisms could be improved. Privacy compliance is limited in the provided content with no visible privacy or cookie policies, which is a notable gap. Overall, the website is trustworthy and professionally maintained but could enhance transparency and compliance documentation.

Scanned

NIS2 and GDPR posture

GDPR outside view
68/ 100 · Medium
Checks completed
7of 7

NIS2 Art. 21(2)

  1. (a) Risk analysis and security policies: Not visible from outside
  2. (b) Incident handling: One indicator
  3. (c) Business continuity, backups and crisis management: Not visible from outside
  4. (d) Supply chain security: Not visible from outside
  5. (e) Secure acquisition, development and maintenance, including vulnerability handling: Partly checked
  6. (f) Assessing the effectiveness of security measures: Not visible from outside
  7. (g) Cyber hygiene and security training: Not visible from outside
  8. (h) Cryptography and encryption: Partly checked
  9. (i) HR security, access control and asset management: One indicator
  10. (j) Multi-factor authentication and secured communications: Not visible from outside

This scan rated NIS2 with an earlier keyword method that is no longer shown; rescan for the per-article view. Risk management, continuity, supply chain, training, MFA, management oversight (Art. 20) and incident reporting (Art. 23) need internal evidence, and Guard cannot tell whether NIS2 applies to this organisation.

GDPR is indicative only, based on publicly visible signals: Articles 7, 12, 13 and 32 of Regulation (EU) 2016/679 and Article 5(3) of the ePrivacy Directive. Not a certification or legal assessment.

Priority findings

2 findings rated critical or high. Fix these first.

  1. GDPR outside view

    These are the privacy signals visitors and data protection authorities look for under GDPR.

    • High

      No Cookie Consent Banner found

      GDPR requires explicit consent for non-essential cookies

      What to do: Implement a cookie consent banner that appears on first visit

  2. SSL/TLS

    TLS encrypts the connection and proves the site is really yours. Weak or expiring certificates trigger browser warnings and put traffic at risk.

    • High

      Weak Protocols Supported

      Server supports weak protocols: TLSv1.1

      What to do: Disable TLS 1.0, TLS 1.1, and all SSL versions

      • CWE-327
      • OWASP A04:2025
      • ASVS V12.1.1

Need hands-on remediation? Email guard@offseq.com

Keep watching three.co.uk

This scan found 14 issues across 6 checks. Monitoring re-runs those checks daily, emails you when something material changes and records each fix, so you can show progress.

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Recommended

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  • TLS certificates and expiry
  • DNS records
  • SPF, DKIM and DMARC
  • Security headers
  • GDPR and NIS2 posture
  • Exposed services
  • Third-party trackers
  • Security score drift

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Results by check

Each check with its score, findings and the evidence it collected.

How this score is calculated

The security score runs 0–100, higher is better. It is the plain average of the security checks that completed in this scan, each counted equally. A check that could not run is left out: it counts neither as a pass nor as a fail.

Counted in this score

SSL/TLS
82
Security headers
80
Email security
92
DNS health
75
Network security
100
GDPR outside view
68
Average
83

Not counted

  • NIS2 outside view: Re-weights evidence from the TLS, email, DNS, network and hygiene checks, so counting it would count that evidence twice. Shown on its own.
  • OffSeq Observations: An AI reading of the site, useful context but not reproducible evidence. Shown on its own.

Findings that cap the score at 49

Each of these is serious on its own, so while any is present the site cannot rate better than high risk, however good the other checks are.

  • The certificate is not trusted by browsers
  • The website is not served over HTTPS
  • A database, remote desktop, file-sharing or Telnet service is reachable from the internet
  • The page loads a script from a compromised source
  • The domain registration has expired
  • SPF authorises every server to send mail as the domain

Partial scans

When the site blocks Guard or most checks cannot run, the score covers only the checks that ran (usually DNS and email), is capped at 75 and is shown as partial, without a risk level.

Risk levels

  • Critical0–25
  • High26–49
  • Medium50–75
  • Low76–100

Technical appendix

Business context, site observations and technical notes gathered during the scan, and the standards behind each reference.

Business context

Business profile

Three UK holds a significant market position as a leading mobile network operator in the UK, leveraging 5G technology to attract consumers and businesses. Their business model focuses on providing a range of mobile and broadband services with competitive pricing and device offerings. The company benefits from being part of CK Hutchison Holdings, a global conglomerate, which supports its scale and resources. The website's content and marketing tools reflect a focus on customer acquisition and retention through digital channels. The absence of detailed contact information and compliance policies in the analyzed content suggests these may be located elsewhere or require better visibility. The partnership ecosystem includes major advertising and analytics providers such as Google and Adobe.

Security posture

The website employs HTTPS with a presumably strong SSL configuration, enhancing data confidentiality and integrity. However, the absence of visible security headers like Content-Security-Policy or X-Frame-Options reduces defense in depth. No exposed sensitive data or vulnerable libraries were detected in the analyzed content. The lack of a security.txt or vulnerability disclosure page limits transparency for security researchers. Forms and input fields were not detected in the provided snippet, so input validation and CSRF protections could not be assessed. Overall, the security posture is good but could be improved by implementing additional HTTP security headers and formal vulnerability disclosure processes.

Recommendations

  1. Implement and publish a comprehensive privacy policy and cookie policy with clear consent mechanisms to improve GDPR compliance.
  2. Add security headers such as Content-Security-Policy, X-Frame-Options, and X-XSS-Protection to enhance security posture.
  3. Publish a security.txt file or vulnerability disclosure policy to facilitate responsible reporting of security issues.
  4. Ensure all forms and input fields have proper validation and CSRF protections to prevent common web vulnerabilities.
  5. Increase visibility of contact information including support emails and phone numbers to improve business credibility and user trust.

Contact details published on the site

Legal name
Hutchison 3G UK Ltd
Registration number
03885486
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Hutchison 3G UK Ltd (Three)
Description
Get phones, tablets, Mobile Broadband and SIM Only deals on the UK’s Fastest 5G Network.
Key services
Mobile phone plans, Tablets, Mobile Broadband, SIM Only deals
Content quality
good
Branding
consistent

Technology

Stack
Adobe Experience Manager (AEM), Google Tag Manager, Adobe Launch, Helix RUM, Cloudfront CDN
Frameworks
Adobe Experience Manager
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Google site verification present

Analytics and tracking

Services
Google Analytics (via GTM), Adobe Helix RUM
Tracking level
moderate
Privacy practices
basic

Advertising

Ad networks
DoubleClick (Google Ads)
Tracking pixels
Adobe Launch
Marketing tools
Adobe Launch
Transparency
good

Site quality

Design
good
User experience
good
Content relevance
good
Navigation
good
Professionalism
good
Trustworthiness
high

Key observations

  1. Website is fully accessible with no WAF blocking
  2. No WHOIS data available for www.three.co.uk domain, indicating it is not a registered domain
  3. Website uses modern Adobe Experience Manager CMS
  4. Strong branding and professional design consistent with a major UK telecom operator
  5. No privacy or cookie policy links found in the provided HTML snippet
  6. No explicit contact emails or phone numbers found in the provided HTML snippet
  7. Multiple external scripts for analytics and marketing detected
  8. No security.txt or vulnerability disclosure information found
  9. No adult or NSFW content detected
Technical notes

Notes

The website is built on Adobe Experience Manager, a robust enterprise CMS platform, integrated with Google Tag Manager and Adobe Launch for analytics and marketing. The use of Cloudfront CDN suggests a scalable hosting environment. Performance is moderate with asynchronous loading of scripts. The site is mobile optimized and SEO friendly with appropriate meta tags and Open Graph data. Accessibility features are basic but present. There is room for improvement in security headers and privacy compliance documentation. The domain WHOIS data is unavailable for the www subdomain, indicating a possible alias or redirect setup, but the main domain three.co.uk is known and legitimate.
Standards and sources

Reference chips under each finding point to the standard, regulation or specification the finding relates to. They are taken from the official datasets below and mapped conservatively: a finding with no defensible link shows none. NIS2 and GDPR references mark where a finding is relevant evidence, not a compliance verdict. Implementing Regulation (EU) 2024/2690 binds digital infrastructure and digital service providers; for other entities it is the most detailed public reading of the Article 21 measures. WCAG, EN 301 549, European Accessibility Act and Web Accessibility Directive references name the requirement an automated accessibility rule relates to; they are not a conformance verdict.

Retrieved 2026-10-25

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