Penetration Testing in London
Web application, network, API and cloud penetration testing for London, United Kingdom businesses — a real black-box attack run by an AI agent swarm and directed by an experienced tester, not a scan with a report template on the front.
Ranked findings with proof-of-concept evidence, remediation guidance your engineers can act on, a compliance-ready report, and a retest included. Serving London and the wider Greater London area.
Penetration testing for London businesses
Security Arsenal runs penetration tests for organisations across London, United Kingdom and the wider Greater London area — including Manchester, Birmingham, Leeds, Glasgow. Testing is delivered remotely, so a London engagement runs on the same timeline and the same price list as one anywhere else in United Kingdom.
Most London clients come to us for one of three reasons: a compliance deadline (SOC 2, PCI DSS, HIPAA), a customer security questionnaire that demands a recent third-party test, or a cyber-insurance renewal. All three need the same thing — a real test with evidence, not a scanner export with a logo on it.
Our finance and tech clients in the region typically start with an external network and web application test, then add internal network or cloud scope once the perimeter is clean.
What we test in London
Scoped to what you actually run — nothing tested that you have not authorised in writing.
Web Application
Full OWASP Top 10, authentication and session flaws, and business logic abuse against the applications your London customers actually use.
External & Internal Network
Perimeter attack surface, exposed services, credential attacks, Active Directory escalation and realistic lateral movement across your London environment.
Cloud (AWS / Azure / GCP)
IAM misconfiguration, storage bucket exposure, serverless attack surface, container escape paths and service account abuse.
API & AI-Assisted Deep Testing
REST, GraphQL and SOAP APIs — IDOR/BOLA, mass assignment, rate-limit abuse — plus zero-day research against custom code where scoped.
What London clients receive
Five deliverables on every engagement — not a raw findings dump, and you are covered while you work through them.
Technical Report
CVSS-scored findings with proof-of-concept evidence, affected assets, and step-by-step remediation.
Executive Summary
Business-risk framing your leadership and board can act on without a translator.
Compliance Mapping
Findings mapped to PCI DSS, SOC 2, HIPAA, OWASP and NIST references for your auditor.
Retest Included
We retest critical and high findings after you remediate and reissue the report with closure confirmed.
90-Day Protection Window
Sentinel blocking, configured from the findings we proved against you, across every protected host — free while your team fixes them.
A swarm tests London targets in parallel. A consultancy tests them in sequence.
A traditional engagement is rationed by hours: two testers, two weeks, and whatever they reach in that window is what you find out about. We run a swarm of specialised AI agents — recon, exploitation, business logic auditing and zero-day research — against every endpoint at once, with an experienced tester at the controls throughout — redirecting agents onto what looks promising and pushing the swarm well past where a playbook stops.
How the AI swarm worksPenetration Testing in London — Common Questions
Areas we cover around London
Remote-delivered testing across the whole Greater London area, including:
Get a scoped quote for your London environment
Tell us what you run and what you need to prove. We scope it, price it, and respond within one business day.