CREST-Certified Penetration Testing in London and the UK
EJN Labs is a UK-based penetration testing firm headquartered in London. We deliver CREST-certified pen testing across the whole of the UK with same-week turnaround. Remote scoping for clients anywhere in the country; on-site visits available wherever you are. Strong financial-services, fintech, and law-firm focus.
- Unlimited retesting
- Unlimited pre-retesting
- No hidden fees
“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.”
For UK financial services firms, law practices, FCA-regulated clients, and SaaS startups anywhere in the country, working with a UK-based pen testing firm has real practical advantages: no time-zone offset on critical-finding calls, on-site availability for sensitive engagements (paper records, air-gapped networks, hardware testing), UK jurisdiction for data residency, and remote or in-person scoping wherever you are.
A UK pen testing firm. Jurisdiction, timezone, and accountability that match your business.
EJN Labs is headquartered at 44-45 Beaufort Court Admirals Way, London E14 9XL. We deliver penetration testing across the entire UK with on-site engagements available within 1-2 business days, wherever you are. Clients across the country benefit from the same FCA-aligned methodology, same-week turnaround on standard engagements, and remote or face-to-face scoping calls.
TWELVE SERVICES · UK-WIDE
Penetration Testing Services Delivered Across the UK
Every CREST service, delivered across the UK with same-week turnaround, wherever you are. Follow any service for detail.
Web App Pen Testing
OWASP Top 10 + ASVS, manual exploitation of business-logic flaws, IDOR, SSRF, broken authentication. CREST-certified testers.
Mobile App Pen Testing
iOS + Android against OWASP MASVS. Frida runtime, SSL pinning bypass, biometric bypass, backend API. CREST-certified testers.
API Pen Testing
OWASP API Top 10 (BOLA, BFLA, BOPLA), REST + GraphQL + gRPC. Schema-aware coverage.
External Pen Testing
PTES + NIST SP 800-115. Public-IP attack surface, exposed services, subdomain takeover, weak SSL/TLS.
AWS Cloud Security
CIS AWS Foundations Benchmark v3.0. IAM, S3, EKS, Lambda, KMS. Manual exploitation chains.
Azure Cloud Security
CIS Microsoft Azure Foundations v3.0. Entra ID, RBAC, Key Vault, AKS, Storage.
GCP Cloud Security
CIS Google Cloud Platform Foundations v3.0. IAM impersonation, GKE, Cloud Storage, Secret Manager.
Red Teaming
MITRE ATT&CK-mapped adversary simulation. STAR-aligned + TIBER-UK methodology.
VAPT
Combined automated scanning + manual exploitation. Audit-grade compliance evidence.
Threat Intelligence
CREST CTI capabilities. Sector-specific threat actor profiling, dark-web monitoring.
Attack Surface Monitoring
Continuous external asset discovery, exposed services, leaked credentials.
Cyber Essentials Plus
IASME-accredited Cyber Essentials Certifying Body. Pre-audit gap analysis, full CE+ testing.
FOUR-PHASE METHODOLOGY
Same-Week CREST Penetration Testing, UK-Wide
CREST methodology delivered with UK-timezone scoping, on-site availability across mainland UK, and same-week turnaround for clients everywhere.
Scope & Threat Model
CREST-aligned scoping call. Threat model agreed with the customer. Rules of engagement signed. Fixed-price quote confirmed before work begins.
Live Findings
Critical findings reported live during testing, not held back to the final report. Direct engineer access via the EJN portal.
Manual Exploitation
Hands-on testing by a CREST-certified pentester. Business-logic exploitation, chained vulnerabilities, privilege escalation, impact validation.
Report & Retest
CREST-acceptable report format. Findings mapped to specific control IDs. Free retest within 30 days. Letter of attestation provided.
CREDENTIALS
Verified Accreditations Auditors Accept
Every credential below is independently verifiable. UK procurement teams, FCA supervisors, ISO 27001 / SOC 2 auditors, and cyber insurance underwriters all recognise these standards.
GET YOUR QUOTE
Get my fixed quote in 24 hours
A fixed-price quote back in one business day, from a named CREST assessor. 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 price from £3,500 for a single-role, single-app scope, agreed up front. Most engagements run £5,000 and up. No day-rate surprises.
Under NDA Further named references available on a scoping call.
- We reply within one business day with a fixed-price quote from a named CREST assessor.
- You approve the scope and we book a start date, usually within 24 hours.
- Live findings land in your client portal as we test, with a free retest of every fix.
Get your fixed pen test quote in 24 hours
Quote request received
We will reply within one business day with your fixed-price quote from a named CREST assessor.
Your data stays with us. No newsletter signup.
or book a 20-min scoping call first
We reply within one business day. Your data stays with us. No newsletter signup.
COMPLIANCE READY
Pen Testing Reports Mapped to Every Framework
SYSC alignment, FG16/5 cyber resilience evidence, FG23/3 Operational Resilience evidence for FCA-regulated firms across the UK.
FCA Cyber Resilience
PRA-regulated banks, building societies, insurers, Operational Resilience scenario testing, severe-but-plausible event evidence.
PRA Operational Resilience
Solicitors Regulation Authority Cyber Standard alignment for UK law firms, from City to regional practices.
PCI DSS
Req 11.3 testing evidence for UK e-commerce, payment processors, and PCI-scoped businesses nationwide.
ISO 27001 + SOC 2
Annex A.12.6.1 / Trust Services Criteria mapping for UK SaaS, fintech, and B2B startup clients.
SRA Cyber Standard
CREST-attested testing aligned with UK cyber underwriting requirements, including Lloyd’s market syndicates.
Cyber Insurance
CREST-tested reports accepted by cyber insurance underwriters as evidence of due diligence.
PRICING
Transparent UK Penetration Testing Pricing
All UK engagements include same-week turnaround, on-site availability nationwide, and remote or face-to-face report walkthroughs. Price varies by service and scope.
Depends on scope and complexity
Single-target engagement (web / external / API / mobile). Same-week start. Remote or in-person scoping (at our London HQ or your office).
Get a fixed quoteDepends on scope and complexity
Combined engagement (web + API + external + AD). On-site internal testing available anywhere in the UK. FCA / SRA aligned reports.
Get a fixed quoteDepends on scope and complexity
Enterprise UK engagement with multiple offices, hybrid cloud, regulated workloads, board-level briefings. M&A cyber DD on demand.
Get a fixed quoteBY SECTOR
Penetration Testing for UK Businesses by Sector
Sector-specialist scoping for UK businesses with sector-specific compliance regimes and threat models.
Fintech & FCA-Regulated
FCA-regulated firms, Open Banking, payment APIs, PCI scoping.
Fintech sector pageSaaS Companies
Multi-tenant isolation, SSO/SAML/OIDC, customer-data perimeter, SOC 2 evidence.
SaaS sector pageLaw Firms
Privileged-data confidentiality, partner-tier scrutiny, SRA Cyber Standard alignment.
Law firm sector pageHealthcare
NHS DSPT, NHS DTAC, EHR integration, telehealth, patient-data PII.
Healthcare sector pageInsurance
FCA / PRA Operational Resilience, claims data, broker integrations, cyber underwriting evidence.
Insurance sector pagePublic Sector
CCS / G-Cloud framework, NCSC-aligned, SC-cleared testers available.
Public sector pageWHY EJN LABS
What You Actually Get
What distinguishes our service from automated scans and box-tick competitors.
What You Get From CREST Penetration Testing
Five things that distinguish our service from automated scans and box-tick competitors.
London HQ, UK-Wide Delivery
Headquartered at 44-45 Beaufort Court Admirals Way, London E14 9XL. We deliver across the entire UK; the London HQ is for face-to-face scoping and in-person workshops when you want them.
FCA / PRA / SRA Specialism
Strong financial-services and legal-sector specialism across the UK. Reports pre-mapped to SYSC, Operational Resilience, SRA Cyber Standard.
UK-Wide On-Site Delivery
On-site engagements available anywhere in mainland UK, typically within 1-2 business days. No callout fees, no travel surcharges.
UK CREST + IASME + ISO 27001 + ISO 9001
Independently accredited. Verifiable on the CREST marketplace. UK delivery, UK data residency, GDPR-compliant throughout.
Letter of Attestation
Every engagement closes with a CREST-aligned letter of attestation, the signed proof auditors, regulators, and insurers ask for.
FAQ
Frequently Asked
Where is EJN Labs based?
We are headquartered at 44-45 Beaufort Court Admirals Way, London E14 9XL. We deliver across the whole UK; the London HQ is for clients who want face-to-face scoping or in-person workshops. Office visits welcome by appointment.
Do you deliver pen testing on-site?
Yes, anywhere in mainland UK. On-site visits are available within 1-2 business days across most of England, and on 2-day notice for Scotland, Wales, and Northern Ireland. Particularly common for internal network testing, physical red team, paper-record discovery, and air-gapped network engagements where remote access isn’t possible.
Do you charge call-out fees?
No. There are no call-out fees, no travel surcharges, no out-of-pocket expenses for engagements anywhere in mainland UK. Travel is included in the fixed-price quote during scoping.
How quickly can you start an engagement?
Standard engagements start within 24-48 hours of contract signature. On-site engagements within next business day. Emergency engagements (incident-driven, M&A urgency, regulator demand), within 4 hours via our priority pipeline.
Do you specialise in FCA-regulated firms?
Yes. FCA-regulated firms are a major sector for us across the UK. Our CREST-aligned methodology is pre-mapped to FCA SYSC, FG16/5 cyber resilience, FG23/3 Operational Resilience, and PRA SS1/21 outsourcing risk requirements.
Do you work with law firms?
Yes. UK law firms are another major sector for us, from City and Canary Wharf practices to regional centres (Manchester, Birmingham, Leeds, Edinburgh, Bristol) and boutique partnerships. We deliver SRA Cyber Standard-aligned testing, conveyancing fraud defence, partner-tier procurement evidence, and privileged-data confidentiality engagements.
How much does penetration testing cost?
Same UK day-rate pricing wherever you are: small engagements £4,000-£8,000, mid-market £8,000-£18,000, enterprise £18,000+. No location surcharge. UK day rates for CREST-certified testers are £1,100–£1,400 per day.
Can you do face-to-face report walkthroughs?
Yes. Face-to-face report walkthroughs at your office anywhere in the UK, or at our London HQ, are included with mid-tier+ engagements. Particularly useful for board-level briefings, audit committee presentations, and regulator preparation meetings.
Do you work with cyber insurance brokers?
Yes. We routinely produce CREST-attested testing reports for UK cyber insurance underwriting and renewal, including reports accepted by Lloyd’s market cyber syndicates and their broker partners.
Can you do M&A cyber due diligence?
Yes. UK PE / VC funds: 5-day accelerated cyber DD reviews on UK acquisition targets, with UK-timezone conference calls and face-to-face partner meetings at our London HQ or your office. Particularly common for fintech and SaaS deal flow.
Where are your testers based?
Our testers are UK-based, working remotely across the country with on-site visits where the engagement requires it. We match testers to engagements by location and clearance level. SC-cleared testers available for public-sector and defence engagements.
Do you sign NDAs?
Yes. Standard NDA before any technical detail is shared. We operate under a project-specific master agreement that includes data handling, deliverable IP, and breach notification clauses. Particularly important for sensitive UK law and financial-services clients.
20+ CREST-certified testing services in one place
Web, mobile, API, cloud, AI, infrastructure, red team. Pick the test that fits your environment.
Get my fixed quote in 24 hours
A CREST-certified pen tester will contact you within one business day with a fixed price, a realistic timeline, and the named consultant. Face-to-face meetings available at our London HQ or your office anywhere in the UK.



