UK CREST Penetration TestingYour Auditor Accepts
You want testing booked, not chased: your CREST penetration testing starts within 24 hours, run only by UK-based, CREST-certified testers across web, mobile, infrastructure, cloud and red team. As a CREST penetration testing company offering penetration testing services across the UK, EJN Labs hands you one report auditors accept for FCA, PCI DSS, ISO 27001, SOC 2 and Cyber Essentials Plus.
When the deadline cannot move, these named UK teams chose EJN Labs and got the result on the timeline they needed
Real EJN Labs clients, named with their permission. They chose us for accreditations they can verify and a CREST team that replies fast, not a sales pipeline.
I would highly recommend EJN Labs to any organisation seeking reliable, detailed, and well-managed penetration testing services, particularly for government or enterprise-level projects.
There wasn’t another company we could find that could deliver what we needed in the timeframe we needed. The client loved it, and we got instant ROI from the engagement.
- CREST approval, publicly verifiable
- IASME Cyber Essentials body
- Active testing within 24 hours
- 100% UK-based testers
Further references, including under NDA, are available on your scoping call.
Before you brief anyone
The date is fixed. Your testing should not wait three weeks to start.
Your audit is booked or a deal is on hold, and the date will not move. Here is the difference a CREST team that starts within 24 hours makes.
The usual pen test
How most engagements go
- Weeks before testing even starts
- An 80-page PDF your team cannot action
- A surprise charge to retest your fixes
- The deadline arrives and you are still waiting
With EJN Labs
How your engagement goes
- Active testing within 24 hours of a signed scope
- Findings live in your portal as they land
- Free retests until every fix passes
- A report your auditor accepts the first time
service types under one CREST-approved, IASME-approved roof, from web and mobile to network, cloud, API, red team, and compliance. You brief one team, not five.
One UK CREST team for every test you need, so you brief once instead of juggling five firms
Where most firms hand you a PDF after four weeks, you get findings live, a free retest of every fix, and a walkthrough built for your team, never an opaque black box.
Every penetration testing engagement at EJN Labs follows recognised methodologies you can point your auditor to. Your testing aligns to OWASP, OWASP ASVS, PTES, NIST SP 800-115, and MITRE ATT&CK, with TIBER-UK or CBEST alignment for regulated firms when required.
Mobile applications are tested against OWASP Mobile Top 10, APIs against the OWASP API Security Top 10, and cloud reviews apply CIS Benchmarks for AWS, Azure, and GCP, supplemented by hands-on exploitation.
EVERY SERVICE TYPE
Pick the exact test your auditor, client or environment is asking for
Every test UK businesses commission, under one CREST-approved roof, from a web app pen test to a multi-week red team, each run by 100% UK-based CREST certified testers against the standard your auditors name. Not sure which you need? A 30-minute scoping call maps your assets and compliance to the right scope.
Web Application Penetration Testing
Find the flaws attackers exploit in your web app. OWASP Top 10 + ASVS, business-logic flaws, IDOR, SSRF. VIEW SERVICEMobile App Penetration Testing
Catch insecure storage and API leaks before release. iOS + Android against OWASP MASVS. Frida runtime. VIEW SERVICEAPI Penetration Testing
Stop broken authorisation exposing your API data. OWASP API Top 10. REST + GraphQL + gRPC. Schema-aware. VIEW SERVICEThick Client Penetration Testing
Uncover hardcoded secrets and weak logic in desktop apps. .NET, Electron, Qt. Reverse engineering with IDA, Ghidra. VIEW SERVICESecure Code Review
Review your source for bugs scanners never see. 11 languages, manual + SAST. OWASP ASVS L1/L2/L3. VIEW SERVICEAI / LLM Penetration Testing
Block prompt injection and data leakage in your LLM. OWASP LLM Top 10. Prompt injection, RAG poisoning, agent abuse. VIEW SERVICEAWS Cloud Security Review
Close the IAM and S3 gaps in your AWS account. CIS AWS Foundations v3.0. IAM, S3, EKS, Lambda, KMS. VIEW SERVICEAzure Cloud Security Review
Spot risky Entra ID and storage misconfigurations in Azure. CIS Microsoft Azure Foundations. Entra ID, Key Vault, AKS. VIEW SERVICEGCP Cloud Security Review
Lock down over-permissioned roles across your GCP projects. CIS GCP Foundations. IAM impersonation, GKE, Secret Manager. VIEW SERVICEExternal Infrastructure Testing
See your internet-facing estate the way attackers do. PTES + NIST 800-115. OSINT-led recon, exposed services. VIEW SERVICEInternal Network Penetration Testing
Trace how far an intruder moves once inside. Assumed-breach testing of Active Directory, lateral movement and internal services. VIEW SERVICEAttack Surface Monitoring
Track new exposed assets the moment they appear. Continuous external asset discovery. 24/7 analyst-validated. VIEW SERVICEVulnerability Assessment (VAPT)
Confirm which scanner findings an attacker can actually exploit. Combined automated + manual. Audit-grade compliance evidence. VIEW SERVICERed Teaming
Test your detection against a real adversary simulation. MITRE ATT&CK adversary simulation. STAR + TIBER-UK methodology. VIEW SERVICEPurple Teaming
Sharpen your blue team while the attack unfolds. Collaborative red+blue. SIEM rule validation, MITRE heatmap. VIEW SERVICEThreat Intelligence
Know which threat actors actually target your sector. Sector-specific actor profiling, dark web, breach corpus. VIEW SERVICEPhishing Assessments
Measure who clicks before a real attacker does. Multi-channel: email, vishing, smishing, OAuth, MFA fatigue. VIEW SERVICECREST Penetration Testing
Prove your security with CREST-certified UK testers. CREST methodology across all service types. Verifiable membership. VIEW SERVICECyber Essentials & CE Plus
Pass certification first time with a managed assessment, not DIY. IASME-accredited Certifying Body. Pre-audit gap analysis. VIEW SERVICESmart Contract & Blockchain Audit
Secure your contract before a single transaction settles. Solidity, Vyper, Move. Reentrancy, oracle manipulation, MEV. VIEW SERVICEBug Bounty Programme
Run a researcher programme without the firefighting. Programme design, pre-bounty hardening, professional triage. VIEW SERVICELondon Penetration Testing
Meet your testers on-site across London and the M25. Canary Wharf-based. M25 same-day on-site. UK data residency. VIEW SERVICEOUR PROCESS
From signed scope to a clean retest in 2 to 3 weeks, and you always know what comes next
Every engagement runs to the same predictable rhythm, so you always know where you are, what comes next, and what is blocking.
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01
Day 0 · 30-min call
Scoping Call
A 30-minute scoping call to fix your scope, attack surface, methodology, rules of engagement, and timeline, with your fixed price confirmed before you sign.
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02
Days 1 to 10
Active Testing
3 to 10 days of hands-on testing by CREST certified testers, with a daily status update and live findings delivered to your portal as they are found.
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03
Week 2 · 60-min call
Reporting & Walkthrough
An executive summary plus a full technical report with CVSS scores, reproduction steps, screenshots, and remediation, talked through on a 60-minute call with your team.
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04
When you’re ready
Free Retest
Once you have fixed the issues, you get a retest at no charge, plus a letter of attestation for your compliance and audit submission.
CREDENTIALS
Every accreditation here is independently verifiable, so your auditor can check it themselves
Every credential below links to its public register, so your procurement team, FCA supervisor, ISO 27001 or SOC 2 auditor, and cyber insurance underwriter can confirm it in seconds, no phone call needed. EJN Labs is CREST certified and IASME approved. You will never see a badge here that EJN Labs cannot prove on a public register.
GET YOUR QUOTE
Get your fixed-price quote in 24 hours from a CREST-certified consultant, with no sales pipeline to chase
A fixed-price quote back in one working day, from a CREST-certified consultant. No sales pipeline, no chasing.
- CREST and IASME accredited. Testing your auditors and clients already recognise.
- Fast-track testing within 24 hours where required. Free retest of every fix included.
- Live findings via your client portal, not a four-week PDF.
- Fixed, scope-based price from £1,200 for a small penetration test scope, agreed up front. Certifications such as Cyber Essentials are priced separately. Most engagements run £3,000 to £8,000. No day-rate surprises.
Dan WilcocksonCo-Founder, CelloriUnder NDA Further named references available on a scoping call.
- Nazia replies the same working dayYou will receive a fixed quote prepared by a CREST-certified consultant.
- You approve the scopeEngagement date is set, usually within 24 hours.
- Live findings land in your client portalTesting is live with free retests for every fix.
Get your fixed-price quote in 24 hours
Quote request received
We will reply within one working day with your fixed-price quote from a CREST-certified consultant.
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or book a 20-min scoping call first
We reply within one working day. Your data stays with us. No newsletter signup.
COMPLIANCE READY
Hand your auditor a report mapped to their exact controls, so your audit team does none of the translation
Your EJN Labs report is structured for direct submission to your auditor or regulator. Every finding is mapped to the exact control reference in each framework, so your audit team reads it in their own language, not yours.
FCA / PRA
SYSC, CBEST, TIBER-UK aligned reporting for regulated UK financial services.
ISO 27001
Findings mapped to A.8.8 technical vulnerability management controls.
SOC 2
Type I & Type II evidence for CC4.1 monitoring and CC7.1 system operations.
PCI DSS
Requirement 11 penetration testing across CDE, segmentation, and applications.
Cyber Essentials Plus
Direct certification, we’re an IASME-approved certification body.
UK GDPR
Article 32 testing, “regular testing of the effectiveness of security measures.”
PRICING
See what every test costs before you ever speak to us, then pay the scope, not the clock
Pen test prices have been kept vague for too long, which is exactly why deals stall on a guessing game. You see exactly what each test type costs, what moves the final number, and where most UK teams land.
Indicative ranges. Every test is a fixed, scope-based price agreed at your free scoping call – never an open day rate. Our CREST-registered consultants are valued at £1,100–£1,400 / day, but you are billed the scope, not the clock.
See the full pricing breakdown →SECTORS WE SUPPORT
Skip explaining your sector. Your testers already know its regulator and its attackers
You get scoping from testers who already know your sector’s compliance regime and threat model, so you spend less of the call explaining it.
Financial Services
FCA, PRA, banks, insurance, fintech, payments.
Legal & Professional Services
Privileged data confidentiality, partner-tier compliance.
SaaS & Technology
SOC 2, ISO 27001, multi-tenant security.
Healthcare & Life Sciences
UK GDPR, NHS supply chain, patient data protection.
Retail & E-Commerce
PCI DSS scope, card data environments.
Critical National Infrastructure
NCSC guidance, regulated CNI operators.
WHY EJN LABS
Your audit lands on time and every fix gets re-tested, not just flagged
You get findings live, a free retest of every fix, and a walkthrough built for your team.
Your auditor recognises this accreditation on sight
CREST + IASME accredited. Verified at crest-approved.org. Acceptable for FCA, NCSC, PCI DSS, SOC 2, ISO 27001 audits. Plus IASME Cyber Essentials certification body, bundle baseline + deep testing in one engagement.
Start testing tomorrow, not in three weeks
Active testing within 24 hours. From signed scope to active testing in a single working day where required, including for incident response, audit deadlines, and regulator-driven timelines.
Fix critical issues while testing is still running
Live findings, not 4-week PDFs. Critical issues reported during testing through our client portal, not held back for the final report. Your team can remediate while testing continues.
Hand your auditor a report they can use as it stands
Compliance-ready reports. Reports structured for FCA SYSC, ISO 27001 A.8.8, PCI DSS Requirement 11, SOC 2 CC4.1, and Cyber Essentials Plus. Findings mapped to your specific framework.
Never pay twice to prove a fix worked
Free retests included. Verify remediation of every finding before close-out, included as standard, not a paid add-on. Until your environment passes, we keep testing.
Your data never leaves the UK, and your NDA actually holds
100% UK-based CREST testers. Every engagement is performed by vetted, 100% UK-based testers, matched to your needs, security clearance and compliance scope. That means genuine UK data sovereignty, enforceable NDAs, and no overseas subcontracting.
FREQUENTLY ASKED
What a UK CREST pen test costs, how long it takes, and whether the testers are really UK-based, answered straight
If you don’t see your question here, ask us on a 30-minute scoping call.
How much does a penetration test cost in the UK?
Most UK penetration tests run £3,000 to £8,000. Small web app tests start around £5,000, and complex red team work can pass £50,000+. CREST-certified firms cost 20–40% more than non-certified providers, and you get a fixed price before you sign. See our complete UK pricing guide.
What kind of penetration testing service do I need?
It depends on your assets, risks and compliance needs. SaaS firms usually need web app and API testing. Financial services need internal network and Active Directory tests aligned to FCA expectations. Cloud-native teams need AWS, Azure or GCP reviews, and mobile-first products need iOS and Android testing. Not sure? A 30-minute scoping call maps you to the right tests.
Will this help us meet compliance requirements?
Yes. Penetration testing is required or strongly recommended under ISO 27001 (A.8.8), Cyber Essentials Plus, PCI DSS Requirement 11, SOC 2 (CC4.1, CC7.1) and FCA SYSC. Your report is shaped to match these frameworks, so you can hand it straight to your auditor or board.
How long does a penetration test take?
Active testing starts within 24 hours of a signed scope. A typical engagement runs 2–3 weeks end-to-end (scoping, 3–10 days testing, reporting). Smaller scopes finish in 2 weeks, larger ones in 3–4, and red team programmes run 6–12 weeks. You get a firm timeline at the end of the scoping call. See our timeline guide.
Are your testers CREST certified, and where are they based?
Your testers are 100% UK-based, CREST-certified professionals (CRT and CCT), and EJN Labs is a CREST-approved company. Verify it directly at crest-approved.org. SC clearance is available where a sensitive sector requires it.
What happens if you find something critical?
Critical findings are reported immediately during testing, never held back for the final report. You hear about them through your client portal, with suggested mitigations, and we pause testing if a finding is an active risk. We help you contain and remediate fast, and retest once fixes are deployed.
22 security testing services in one place
Web, mobile, API, cloud, AI, infrastructure, red team. Pick the test that fits your environment.
Tell us what to test. Get a fixed price and a real start date within one working day.
Tell us what you need to test. A CREST-certified pen tester will contact you within one working day with a fixed price and a realistic timeline. No sales pipeline.
