CREST Certified
Features
CREST-Certified Penetration Testing for UK Businesses
We provide cutting edge CREST certified cyber security services to clients across the globe following OWASP and NIST methodologies.
Start within 24 hours
Plan, scope, get quoted and start your next pentest all in one place and start as early as the next 24 hours.
Immediate Alerts
No more waiting weeks before getting the final pentest report, our platform gives you live visibility of all findings as and when they are submitted.
Seamless Integration
We can provide custom integration points with your chosen data ingestion solution seamlessly communicate findings.
Unlimited Free Re-tests
No more unexpected re-test fees. All pentest findings are free to re-test. All you need to do is to mark a finding and our team will re-test ASAP.
AI-Powered Insights
We use AI powered insights to understand the latest trends in the exploitation techniques and provide the highest quality assessments.
No Cancellation Fees
Clients often need to move the start date of a test due to setup issues. We do not charge rescheduling or cancellation fees.
All-in-One Offensive Cyber Security Services
We Offer More Than Just Standard Cyber Security Services
Our team constantly works to innovate and provide new and custom solutions to client that need more than just standard services
AI Security
AI/LLM Security Testing
With the advent of AI, a new frontier of security threats has emerged. We follow OWASP Top 10 For LLMs to provide a comprehensive coverage of any security gaps. Our team at EJN Labs can help you secure your AI product and protect you from attackers.
Hunters As a Service
Bug Bounty Services
At EJN Labs we offer a custom bug bounty service using a vetted pool of cyber security professionals. Simply sign up to the portal and request a bug bounty project and we will help you incorporate crowd sourced bug bounty services in your security posture.
Latest News & Articles
We blog and report about new findings and features constantly. Keep an eye on this page
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VAPT Testing UK: Complete Guide to Vulnerability Assessment & Penetration Testing
VAPT testing — Vulnerability Assessment and Penetration Testing — combines two distinct security activities into a single coordinated engagement. It’s the most common form…
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How Long Does a Penetration Test Take? UK Guide 2026
“How long does a penetration test take?” is one of the most common questions we get during scoping calls. The honest answer ranges from…
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CREST vs CHECK Penetration Testing: Which Should UK Businesses Require?
CREST and CHECK are the two most-cited UK penetration testing accreditations — and the most commonly confused. They are not the same scheme, they…
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Cyber Essentials Plus: What Penetration Testing Is Required?
Cyber Essentials Plus is the UK government’s premier baseline cybersecurity certification — and one of the most common compliance frameworks UK businesses pursue. But…
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Network Penetration Testing Checklist: 2026 Complete Guide
A network penetration test is only as good as its preparation. The most common reasons tests fail to surface critical vulnerabilities — or waste…
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Penetration Testing Cost UK: 2026 Pricing Guide
The single most common question we get before a scoping call: “How much does a penetration test cost in the UK?” The honest answer…
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EJN Labs Joins Forces with IASME: We Are Now an Official Cyber Essentials Certification Body
We have some exciting news to share. EJN Labs has officially become a Cyber Essentials Certification Body through IASME Consortium. This means we can…
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How to Choose a CREST Certified Penetration Testing Provider (Checklist)
Key Takeaways Introduction Selecting a penetration testing provider is one of the most important cybersecurity decisions your business will make. With cyberattacks increasing in…
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EJN Labs Unveils Attack Surface Monitoring (ASM): Continuous Protection for the Modern Enterprise
Every UK business with an online presence faces an uncomfortable truth: whilst your marketing team launches new campaigns and your developers spin up staging…
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Supply Chain Cyberattacks: 7 Mistakes UK Businesses Are Making with Third-Party Penetration Testing (And How to Fix Them)
Supply chain cyberattacks are decimating UK businesses at an unprecedented rate. Recent data reveals that 85% of UK cybersecurity professionals have experienced at least…
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Are Traditional Pen Testing Companies Dead? Why UK Businesses Need 24-Hour Vulnerability Alerts Instead of Month-Long Reports
The cybersecurity landscape has fundamentally shifted. While traditional penetration testing companies aren't completely extinct, they're rapidly becoming as relevant as a fax machine in…
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7 Mistakes You're Making When Choosing a Penetration Testing Company (And How UK Businesses Can Avoid Them)
Choosing the right penetration testing company can make or break your cybersecurity strategy. Yet every week, UK businesses make costly mistakes that leave them…
Frequently Asked Questions
Here is a list of commonly asked questions from clients
How much does a penetration test cost?
The cost of a penetration test in the UK typically ranges from £3,000 to £15,000, depending on scope, complexity, and whether the environment is internal, external, web-based, cloud-hosted, or mobile. Pricing is scoped using daily-rate. (commonly £1,200-£1400/day)
What kind of penetration testing service do I need?
That depends on your assets, risks, and compliance requirements. For example, a SaaS company will likely need web application and API testing, while a finance firm may need internal network and Active Directory tests. Cloud-based companies may benefit from AWS/Azure security reviews, while mobile-first companies often need iOS/Android app testing. A quick discovery session can map your infrastructure to the most relevant testing types.
Will this help us meet compliance (e.g., ISO 27001, Cyber Essentials Plus, PCI-DSS)?
Yes, penetration testing is often a requirement or strong recommendation under many standards like ISO 27001 (A.12.6.1), Cyber Essentials Plus (for external testing), PCI-DSS (Requirement 11), and others. We tailor the methodology and reporting format to align with these frameworks so you can use the results directly in audits or board reports.
How long does a penetration test take?
A typical engagement lasts 3 to 10 working days, depending on the scope and depth required. Small external scans can take a few days, while complex environments involving multiple applications, APIs, or networks may take 2–3 weeks. We’ll provide a detailed timeline during scoping so you can plan accordingly.
Will the test disrupt our systems or affect users?
Penetration tests are designed to be non-disruptive, but there’s always a minor risk during certain types of testing, such as brute force or denial-of-service attempts. We avoid these by default unless explicitly authorised. All tests are scheduled and coordinated to minimise business impact, and we never test live systems aggressively without written consent.
What do we get at the end of the test? (i.e., what does the report include?)
You’ll receive a comprehensive report that includes an executive summary, risk-ranked findings (e.g., Critical, High, Medium), technical details, real-world impact explanations, and clear, actionable remediation guidance. We also offer a walkthrough session to discuss findings, answer questions, and support remediation efforts if needed.
How often should we do penetration testing?
As a general rule, testing should be done at least annually, after any major code changes or deployments, or when there are significant changes to infrastructure. Some clients test quarterly or continuously as part of DevSecOps pipelines, especially in regulated industries or fast-moving tech environments.
Who performs the test and are they qualified/CREST/CHECK certified?
Our testers are experienced professionals, often with CREST, OSCP, or CHECK certifications, and many hold SC clearance if required for sensitive sectors. Each consultant brings deep technical knowledge, real-world attack experience, and familiarity with UK compliance frameworks, ensuring both rigour and relevance.
What happens if you find something critical?
If a high or critical risk is discovered during testing, we follow a responsible disclosure process: you’ll be notified immediately, with suggested mitigations, and we pause further testing if necessary. Our goal is to help you contain and remediate the issue swiftly, and we’ll support you until resolution, including retesting if needed.
Trusted UK Cyber Security Partner
CREST-Certified Penetration Testing in the UK
EJN Labs is a CREST-approved penetration testing company delivering offensive security services to UK businesses. Engagements are led by certified engineers, conducted by our in-house UK team, and aligned to the regulatory frameworks our clients operate under — FCA, PCI DSS, ISO 27001, SOC 2, and Cyber Essentials Plus. We are also an IASME-approved Cyber Essentials certification body. Verify our CREST accreditation at crest-approved.org.
Our Services
Penetration Testing Services We Offer
Full-spectrum offensive security testing — from targeted application tests to multi-week red team simulations.
Application Security
Web, Mobile & API Testing
OWASP Top 10, business logic, complex authentication flows, multi-tenant boundaries. Covers web applications, mobile apps (iOS/Android), REST and GraphQL APIs, and thick clients.
Infrastructure
External & Internal Networks
Internet-facing assets, exposed services, vulnerability exploitation, perimeter assessment. Active Directory attacks, lateral movement, privilege escalation, segmentation testing. Covers external infrastructure and internal networks.
Advanced & Compliance
Red Team, AI & VAPT
Multi-week assume-breach red team exercises, spear phishing campaigns, AI/LLM security testing (prompt injection, model abuse), and VAPT for compliance evidence.
Why Choose Us
Why UK Businesses Choose EJN Labs
Seven things that distinguish EJN Labs from other UK pen testing companies — and why regulated firms keep choosing us.
CREST-Approved
Verifiable at crest-approved.org. Acceptable for FCA, NCSC, PCI DSS, SOC 2, ISO 27001, and cyber insurance audits.
UK-Based Delivery
All work performed by our in-house UK team. No subcontracting. Important for data sovereignty and NDA enforceability.
24-Hour Startup
From signed scope to active testing in 24 hours where required — including for incident response and audit deadlines.
Live Findings Delivery
Critical issues reported during testing, not held back for the final report. Your team can remediate while testing is in progress.
IASME Cyber Essentials Body
Combine baseline Cyber Essentials Plus certification and deep penetration testing under a single coordinated engagement.
Compliance-Aligned Reporting
Reports structured for FCA, ISO 27001, PCI DSS, SOC 2, and Cyber Essentials Plus audit submissions. Findings mapped to your specific framework.
Free Retests Included
Verify remediation of findings before close-out. Included as standard, not as a paid add-on.
Geographic Coverage
London & UK-Wide Coverage
EJN Labs serves businesses across London, the South East, and the entire United Kingdom. For London-based engagements requiring on-site work — physical penetration testing, internal network testing, wireless security assessments — our engineers can be on-site within the M25 the next business day.
For UK-wide and remote engagements we deliver via secure VPN and our client portal. See our London penetration testing services page for sector-specific information including FCA-aligned testing for financial services.
Sectors We Work With
- Financial services & FCA-regulated firms
- Legal & professional services
- SaaS and technology companies
- Healthcare & life sciences
- Retail & e-commerce (PCI DSS)
- Critical national infrastructure
Investment & Timeline
Pricing & Engagement Timeline
Transparent pricing scoped to your environment. Most engagements complete in 2–3 weeks end-to-end including scoping, active testing, and reporting.
Web Application Test
From £2,500
Mid-size apps £3,500–£6,500. Complex multi-tenant SaaS £7,000+. Full pricing guide.
Infrastructure Test
From £3,500
External infra (50 IPs) £3,500–£4,500. Internal networks (100 nodes) £4,000–£8,000.
Engagement Timeline
2–3 Weeks
Scoping → active testing → final report. Red teams 6–12 weeks. Detailed timelines.
Build. Scale And Secure with EJN Labs.
Get started without limits. We are here to help you.
