UK penetration testing

Penetration testing & cyber security that finds what scanners miss.

UK-based security experts who manually test your applications, networks and infrastructure. Detailed reporting with actionable fixes — not just a list of CVEs.

XL Marketing penetration testing — a UK security analyst reviewing a vulnerability report
Why pen testing matters

Find your weak points before an attacker does

Cyber attacks against UK businesses are no longer rare, and they are no longer aimed only at the giants. Small and mid-sized organisations are now squarely in the crosshairs of opportunistic attackers, ransomware groups and credential-stuffing bots — and the consequences of a breach run far beyond the immediate cost. Lost data, downtime, regulatory fines, contractual penalties and the reputational damage of explaining the incident to customers all add up quickly.

A penetration test puts that risk under a microscope. Our certified ethical hackers attempt to break into your systems, applications and networks in the same way a real attacker would — safely, in a controlled engagement, with your full knowledge and consent. The result is a clear, prioritised report of what an attacker can actually do today, and a practical, plain-English plan for closing those gaps.

A full range of security assessments

We test everything that faces the modern threat landscape — web applications, APIs and SaaS platforms, internal & external networks, cloud environments (Azure, AWS, Microsoft 365), mobile apps, phishing & social engineering and dark-web monitoring for compromised credentials. Engagements are aligned with the OWASP Top 10, PTES and CREST methodologies, and every test concludes with a free retest so you can confirm fixes are in place before sign-off.

  • Web applications
  • APIs & SaaS
  • Internal & external networks
  • Cloud (Azure · AWS · M365)
  • Mobile apps
  • Phishing & social engineering
  • Dark-web monitoring

Whether you're running an annual security audit, preparing for a tender, responding to a customer security questionnaire or proactively hardening your environment before launch, our team can scope the right test for the situation. Get in touch using the form below for a no-obligation scoping conversation.

Our approach

Manual testing, not just scans

Certified ethical hackers exploit weaknesses the way real attackers would — across apps, networks, cloud and people.

How we work — free retest, CE+ and SOC 2 ready reporting, detailed reports and expert vulnerability assessment

Sign-off ready

Reports built for audit

Every engagement closes with a free retest. Outputs aligned to Cyber Essentials Plus and SOC 2 expectations.

What we test

Every attack surface, covered

Our certified security experts cover every attack surface — from your web apps to your people.

Web application testing

Manual and automated testing of your web applications against OWASP Top 10 and beyond. We test authentication, session management, API endpoints and business-logic flaws.

  • OWASP Top 10
  • API security
  • Authentication testing
  • Session management

Stealer logs & dark-web monitoring

Proactive monitoring of dark-web forums and stealer logs for compromised employee credentials. We alert you before attackers can use them.

  • 24/7 monitoring
  • Instant alerts
  • Credential recovery
  • Threat intelligence

Architecture & infrastructure review

Full security audit of your IT architecture — cloud configurations, network segmentation, access controls and compliance posture.

  • Cloud security
  • Network segmentation
  • Access controls
  • Compliance check

Social engineering & phishing

Test your human firewall with realistic phishing campaigns, vishing calls and physical security assessments. Includes staff awareness training.

  • Email phishing
  • Vishing tests
  • Physical security
  • Staff training

Not sure which service you need?

Talk to a security expert
Our process

How it works

We follow OWASP, PTES and NIST methodologies to ensure thorough, repeatable results.

Discovery & scoping

We define the scope, map your attack surface and gather intelligence — the same way a real attacker would.

Vulnerability assessment

Automated scanning combined with manual techniques to identify weaknesses in systems, apps and configurations.

Exploitation & testing

We safely exploit vulnerabilities to understand their real-world impact and how far an attacker could get.

Reporting & remediation

A prioritised report with clear findings, risk ratings and step-by-step remediation guidance your team can act on.

Why XL Marketing

Built for UK businesses that take security seriously

Certified ethical hackers, clear reporting and a delivery model built around your sign-off — not just a scan output.

100+ UK businesses protected

Hundreds of engagements across SaaS, e-commerce, automotive, finance and public sector.

CREST · CE+ accredited

Methodology-aligned engagements that stand up to auditor, insurer and enterprise scrutiny.

Free retest, every engagement

After remediation we re-verify your fixes at no extra cost before signing off.

Plain-English reporting

Executive summary for the board, deep technical report for the team — no jargon-only PDFs.

Certifications & accreditations

  • CREST Approved
  • Cyber Essentials Plus
  • CHECK Team Leader

All tests under strict NDA with full liability insurance.

Get your free assessment

Transparent pricing

All packages include comprehensive reporting and expert remediation guidance.

Essential

£4,500

Starting from

For small businesses and startups

  • Web application testing (up to 3 apps)
  • Basic vulnerability assessment
  • OWASP Top 10 coverage
  • Executive summary report
  • 48-hour turnaround
  • Remote testing only
  • Email support
Most Popular

Professional

£7,500

Average investment

Our most popular package for growing businesses

  • Everything in Essential, plus:
  • Up to 5 environments tested
  • Stealer logs & credential monitoring
  • Social engineering assessment
  • Detailed technical report
  • 2-week delivery
  • Remediation guidance
  • Phone & email support

Enterprise

£13,500+

Custom pricing

Comprehensive security for large organisations

  • Everything in Professional, plus:
  • Unlimited environments
  • Architecture review included
  • Development team to fix issues
  • Government standard compliance
  • 4-week engagement
  • Quarterly retesting
  • 24/7 priority support
  • On-site testing available

Still have questions about our penetration testing services?

Frequently asked questions

Everything you need to know about our penetration testing services.

Still have questions?

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