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Security report for derwentlondon.com

Derwent London · Real Estate · United Kingdom

Medium risk. 3 critical or high findings in Security headers, SSL/TLS and 1 other check.

Security score

75/100

Risk levelMedium

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

Derwent London is a prominent British property investment and development company headquartered in London, recognized as the largest London office-focused Real Estate Investment Trust (REIT) and a constituent of the FTSE 250 Index. The company manages a substantial portfolio of commercial real estate valued at £5.2 billion as of mid-2025, focusing on long-term value creation through property regeneration. Their services include office and retail space leasing, flexible furnished workspaces, and community-focused DL/Members lounges. The website reflects a mature digital presence with comprehensive content targeting investors, tenants, and partners. Technically, the website employs modern web technologies including Google Tag Manager, Google Analytics, and cookie consent management, ensuring compliance with privacy regulations such as GDPR. The site is mobile-optimized, accessible, and SEO-friendly, although no CMS or hosting provider details are explicitly identified. Performance is moderate with good user experience and navigation clarity. From a security perspective, the site enforces HTTPS and uses cookie consent mechanisms with granular controls. However, no explicit security headers were detected in the HTML source, and there is no published security policy or vulnerability disclosure program. The absence of WHOIS data limits domain trust verification, but the professional presentation and multiple industry certifications support legitimacy. Overall, Derwent London’s website demonstrates strong business credibility and privacy compliance, with room for improvement in security best practices and transparency. The domain’s WHOIS data absence warrants monitoring but does not currently undermine the site’s trustworthiness.

Scanned

NIS2 and GDPR posture

GDPR outside view
83/ 100 · Low
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

3 findings rated critical or high. Fix these first.

  1. Security headers

    Security headers are instructions your web server sends to every visitor’s browser. Missing ones leave visitors more exposed to attacks such as clickjacking and injected scripts.

    • High

      Missing Strict-Transport-Security header

      Forces HTTPS connections

      What to do: Add "Strict-Transport-Security: max-age=31536000; includeSubDomains; preload"

      • CWE-319
      • OWASP A04:2025
      • ASVS V3.4.1

  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

  3. DNS health

    DNS sends visitors and email to the right servers. Misconfigured records can cause outages or let someone redirect your traffic.

    • High

      Domain Expires Soon

      Domain expires in 21 days

      What to do: Renew domain registration before expiration

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

Keep watching derwentlondon.com

This scan found 22 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.

Daily monitoring

Recommended

€25per month

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

Email alerts on material changes and an exportable JSON history of every change.

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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
62
Security headers
55
Email security
80
DNS health
70
Network security
100
GDPR outside view
83
Average
75

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

Derwent London holds a leading market position as the largest office-focused REIT in London, leveraging a business model centered on property investment and regeneration to create long-term value. Their portfolio and development pipeline emphasize sustainability and innovation, as evidenced by multiple awards and certifications. The company targets institutional investors, commercial tenants, and community members through diversified offerings including flexible workspaces and DL/Members lounges. Their digital ecosystem includes partner sites for specific properties and a strong social media presence, enhancing brand reach and stakeholder engagement. The company’s inclusion in the FTSE 250 and transparent investor relations content indicate financial stability and growth orientation.

Security posture

The website exhibits a mature security posture with enforced HTTPS and a comprehensive cookie consent framework supporting GDPR compliance. Use of Google ReCAPTCHA for form security is noted. However, the absence of key security headers such as Content-Security-Policy and X-Frame-Options represents a gap in defense-in-depth. No visible vulnerabilities or exposed sensitive data were detected. The lack of a published security policy or incident response contact limits transparency and preparedness communication. Overall, the security maturity is good but could be enhanced by adopting additional HTTP security headers, publishing a vulnerability disclosure policy, and formalizing incident response information.

Recommendations

  1. Implement and verify HTTP security headers including Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options to strengthen browser security.
  2. Publish a formal security policy and incident response contact information to improve transparency and stakeholder trust.
  3. Establish a vulnerability disclosure program or security.txt file to facilitate responsible reporting of security issues.
  4. Regularly audit third-party scripts and tracking technologies to minimize potential security and privacy risks.
  5. Monitor WHOIS data and domain registration details to ensure consistency and mitigate risks related to domain legitimacy.

Contact details published on the site

Addresses
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Derwent London
Description
Derwent London is a British-based property investment and development business. It is headquartered in London and is a constituent of the FTSE 250 Index. Owns a portfolio of 5.3 million sq ft of commercial real estate valued at £5.2bn as at 30 June 2025. Largest London office-focused Real Estate Investment Trust (REIT).
Key services
Property investment, Property development, Office and retail space leasing, Furnished + Flexible workspace offerings, DL/Members community spaces
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, Google Tag Manager, MyFonts Webfonts, Cookie Consent Manager by Ten4, Google Analytics, Investis Digital analytics, YouTube embeds, Vimeo embeds
Performance
moderate
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Cookie consent banner with granular controls
  • No exposed sensitive data in HTML
  • Use of Google ReCAPTCHA for form security

Analytics and tracking

Services
Google Analytics, Investis Digital
Tracking level
moderate
Privacy practices
good

Advertising

Tracking pixels
Investis Digital
Transparency
good

Site quality

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

Key observations

  1. Website is fully accessible with rich content and navigation
  2. Strong corporate branding and consistent messaging
  3. Comprehensive cookie consent and privacy compliance mechanisms
  4. No visible security headers detected in HTML source
  5. WHOIS data unavailable, limiting domain trust verification
  6. Multiple industry certifications and awards displayed
  7. Active social media presence across major platforms
  8. Contact information clearly provided with physical address, phone, and email
  9. No evidence of adult or questionable content
Technical notes

Notes

The website is built using modern web technologies including asynchronous JavaScript loading, Google Tag Manager, and third-party analytics services. It employs web fonts licensed via MyFonts and integrates multimedia content from YouTube and Vimeo. The site is mobile-responsive with accessibility features such as skip links and ARIA labels. Performance is moderate, with some large background images used in parallax sections that may impact load times. No CMS or hosting provider is explicitly identified. The cookie consent manager is robust, supporting granular user preferences. Technical risks include the absence of certain security headers and reliance on multiple third-party scripts which require ongoing management.
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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