Penetration Testing Services
Penetration testing that finds the holes attackers will use before they do
and CHECK-aligned penetration testing services for UK mid-market enterprises. External, internal, web application, cloud, mobile and social engineering testing, delivered by UK senior pentesters with developer-readable remediation guidance, not just a PDF.
UK + CHECK certified testers · rapid report turnaround
UK pentest engagements per year
and CHECK aligned methodology
Standard report turnaround, post-test
Certified information security controls
The pattern we see
Most UK pentests prove you are compliant. Few prove you are secure.
Three weaknesses show up in every UK penetration testing engagement we replace. If your last pentest looked like a tick-box exercise, your real cyber security posture is unknown.
The report sits on a shelf
✕
You get a 60-page PDF with severity ratings and screenshots. Your developers struggle to translate it into actionable fixes. Half the findings never get remediated in time.
✓
Developer-readable remediation guidance per finding. Code-level fixes, configuration snippets, and re-test on request.
Scope was wrong from day one
✕
The pentest scoped only what you knew about. Shadow IT, forgotten S3 buckets, and stale subdomains never got tested. Real attackers find them anyway, within days.
✓
Pre-test asset discovery and attack-surface mapping included as standard. We test what attackers actually see.
You cannot prove fixes worked
✕
Six months later, the audit asks for evidence that critical findings were closed. You have an email thread. No retest evidence, no closure proof, no remediation timeline.
✓
Free retest on critical and high findings within 90 days. Closure evidence supplied for audit, with full traceability and reporting.
Six penetration testing service types. One UK team.
What our Penetration Testing Services include.
External, internal, web application, cloud, mobile and social engineering testing, delivered by UK and CHECK-certified senior pentesters under ISO 27001 governance.
External & internal network pentest
experienced UK
Black/grey-box testing of perimeter and internal LAN/WLAN. Privilege escalation, lateral movement and exfiltration paths mapped end-to-end.
- Black-box, grey-box, white-box methodology
- Privilege escalation paths mapped
- Lateral movement + exfiltration testing
Web app & API pentest
OWASP coverage
OWASP Top 10 + API Top 10 + business-logic flaws. Authenticated and unauthenticated. Covers REST, GraphQL, SOAP and WebSocket endpoints.
- OWASP Top 10 + API Top 10 coverage
- Business-logic flaw testing
- REST, GraphQL, SOAP, WebSocket
Cloud & container pentest
AWS / Azure / GCP
AWS, Azure, GCP cloud security misconfiguration testing. Kubernetes, container and CI/CD pipeline assessment. IAM privilege escalation.
- AWS, Azure, GCP misconfig testing
- Kubernetes + container assessment
- CI/CD pipeline + IAM escalation
Social engineering & red team
NIST 800-115
Phishing campaigns, vishing, physical access tests, and full red-team scenarios. Tests your people and process, not just technology.
- Phishing + vishing campaigns
- Physical access testing
- Full red-team scenarios
How we run a pentest
From scope to retest in under 30 days for most engagements.
A predictable three-phase engagement that produces evidence your board, your developers and your auditors can all use.
01
Days 1 – 4
Scope
Asset discovery, attack-surface mapping and rules of engagement. Test plan signed off before any packet is sent. Typically 5 working days.
02
Days 5 – 10
Test
experienced UK execution by UK senior pentesters. Daily stand-ups during the engagement. Critical findings communicated promptly on discovery.
03
Day 11 onwards
Report & retest
Developer-readable report inside 14 days. Board-level executive summary. Free retest on critical + high findings within 90 days, including validated remediation confirmation.
Why Transputec
Four reasons UK security leaders choose us for penetration testing.
Not the cheapest pentest. Not the largest. But the one that consistently produces remediation that developers actually implement and auditors actually accept.
01
+ CHECK certified testers
Every tester carries and/or CHECK certification. Required for UK government, NHS, FCA and CNI engagements.
02
Developer-readable reports
Each finding includes proof-of-concept, business impact, and the exact code-level fix. Your dev team can act without parsing it.
03
Free retest on critical findings
Free retest within 90 days on critical and high findings. Closure evidence supplied for audit and board reporting.
04
UK-only senior pentesters
No offshored testing. Every engagement led by a UK senior pentester with at least 5 years' field experience.
Trusted by UK security teams
UK enterprises that rely on our penetration testing.
Generative AI platform, multi-tier pentest
Air freight services, network + cloud pentest
Hospitality, PCI-aware web app pentest
Cyber Security Services
Other Cyber Security Services from Transputec.
Penetration testing sits inside our wider Cyber Security pillar. Most clients combine annual pentest with continuous vulnerability management, a managed SOC, and ThreatSpike network detection.
← Back to Cyber Security ServicesPenetration Testing FAQs
What UK security leaders ask before signing.
What is a penetration test, and how does it differ from a vulnerability scan?
A penetration test (pentest) is a goal-driven simulated attack against your IT estate by certified human testers. Unlike a vulnerability scan, which lists every known CVE on every asset, a pentest chains weaknesses together to prove what an attacker could actually achieve, data exfiltration, privilege escalation, ransomware deployment, business disruption. Transputec’s pentest team is UK-based and CHECK certified, and aligned with the OWASP Top 10 and MITRE ATT&CK frameworks. For wider context, read our blog on how penetration testing services reduce cyber risk for SMEs.
What methodology do you use (CHECK, OWASP, MITRE)?
We use experienced UK methodology as the baseline, with CHECK for UK government engagements. Web app testing follows OWASP Top 10 and OWASP ASVS. API testing follows OWASP API Top 10. Cloud testing follows CIS Benchmarks. Adversary simulations are aligned to MITRE ATT&CK. For AI / ML testing specifically, we follow the OWASP Top 10 for LLMs. Read our deeper take on penetration testing for AI startups.
How much do Penetration Testing Services cost in the UK?
UK Penetration Testing Services are typically priced per-engagement, sized by scope and target count. Small web app pentest (single app, authenticated + unauthenticated): £6K-12K. Standard external + internal network pentest (50-250 IPs): £9K-18K. Web app + cloud + API combined: £15K-32K. Full red-team scenario: £25K-65K. Bespoke quotes are issued post-scoping call with a fixed price, no day-rate top-ups.
Do you support compliance pentest (PCI DSS, ISO 27001)?
Yes. We deliver pentest engagements aligned to PCI DSS (annual + post-major-change), ISO 27001 Annex A.8.29 Trust Service Criteria, Cyber Essentials Plus, NHS DSPT and FCA operational resilience. Reports include the specific control mappings auditors need. See a real-world AI-platform pentest in our generative AI penetration testing case study for Beagle.
How does retesting work after we remediate?
Free retest on critical and high-severity findings within 90 days of the original report. Retest produces a closure-evidence pack you can hand to auditors or your board. Medium and low findings are retested on the next scheduled engagement or on a paid retest basis if you need it sooner. See a real client engagement in our cyber security case study for WFS, and explore the wider Cyber Security Services pillar for how pentest fits with our other capabilities.
How often should a UK business run a penetration test?
UK regulators and accreditation bodies expect a structured cadence rather than a one-off test. Annual is the baseline for most mid-market organisations (ISO 27001 control A.12.6.1, Cyber Essentials Plus recertification, FCA expectations). Quarterly applies to PCI DSS in-scope environments, regulated financial services, and any internet-facing application with a major release cycle. Triggered testing should follow any material architecture change, breach response or new acquisition. We map the right cadence to your regulatory posture in the scoping call. See the NCSC penetration testing guidance for the wider baseline.
Ready to find your real attack surface?
Talk to a UK -certified pentester this week.
Free 30-minute scoping call. We map your attack surface, agree the test plan, and give you a fixed quote and start date. No deck. No sales pitch.
- -certified pentest scope across web, network and cloud
- Free retest within 90 days of remediation
- Indicative fixed-scope fee with no per-day variation
- Prompt reply. ISO 27001 secure handling.