Penetration Testing London

Discover your network’s weak points with expert penetration testing services in London. Get a fast penetration testing London cost estimate today.

Contact Us 020 4511 9111
<1hr Average response time
CE+ Cyber Essentials
500+ Clients supported
from £25 per user / month
About this service

Outsmart Hackers with Penetration Testing London

Stay one step ahead of cyber threats with Speedster IT’s expert penetration testing services.

Our ethical hacking services simulate real-world attacks to expose vulnerabilities before criminals can exploit them. Combined with dark web monitoring, we help safeguard your sensitive data from being traded or leaked online, and support you in meeting compliance standards and protecting your reputation. Looking to compare penetration testing quotes, or ready to book a penetration test in London? Speedster IT is a trusted pen testing company London businesses can call on.

20+years in London
1-3days per test
500+businesses supported
CE+Cyber Essentials Plus
Penetration testing company in London

Our skilled professionals identify and help you address vulnerabilities in your systems before cybercriminals do, with detailed reports and clear recommendations to strengthen your defences. Want to hire a penetration tester in London? Get in touch to discuss your requirements.

What We Offer

Types of Penetration Testing We Provide

We tailor the scope of every engagement to your specific risks and compliance requirements.

Network Penetration Testing

Evaluates vulnerabilities across servers, routers, firewalls and switches.

Web Application Testing

Detects flaws such as SQL injection, cross-site scripting and authentication issues.

Cloud Security Testing

Assesses the security of cloud-based services and infrastructure.

Mobile Application Testing

Uncovers vulnerabilities in iOS and Android apps handling sensitive data.

24/7 Helpdesk coverage
20+ Years experience
CE+ Cyber Essentials
500+ Users supported
What We Cover

What Our Penetration Testing London Service Covers

Independent, hands-on testing that shows you what an attacker could actually achieve. Compare penetration testing quotes and get a clear view of the penetration testing London cost for your business.

External Infrastructure Testing

Attacking internet-facing systems the way a real attacker would.

Internal Network Testing

Simulating an attacker who has already gained a foothold inside your network.

Web Application Testing

OWASP Top 10 vulnerabilities in your websites, APIs and web applications.

GDPR Compliance Testing

Validating that personal data is stored and handled securely.

Red Team Assessments

Simulating real-world adversaries to test your overall security posture.

Detailed Reporting

Risk-rated findings with clear, actionable remediation guidance.

Why Choose Us

Why Choose Speedster IT for Penetration Testing

A trusted partner in cyber security penetration testing for businesses across London.

Skilled, Experienced Testers

Equipped with the latest tools and techniques to keep your business secure and compliant.

Clear, Actionable Reports

Detailed findings and recommendations to fortify your defences.

Re-Test Included

We re-test after remediation to confirm the fixes have worked.

Pricing

Pen Testing Cost in London

Basic penetration testing, covering essential testing to identify common vulnerabilities and weaknesses, starts at £800. Comprehensive assessments that delve deeper into your network and software are scoped and quoted on a case-by-case basis to find the most economical option for your business.

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Frequently asked questions

Penetration testing (pen testing) is a simulated cyber attack against your systems, networks, or web applications, conducted by security specialists to find exploitable vulnerabilities before real attackers do. It provides independent verification that your defences work as expected and identifies specific weaknesses to fix.

Speedster IT provides: external infrastructure penetration testing (attacking internet-facing systems), internal network testing (simulating an attacker inside the network), web application testing (OWASP Top 10 vulnerabilities), social engineering and phishing simulation, and wireless network testing. We tailor the scope to your specific risks and compliance requirements.

Best practice is annual penetration testing as a minimum, with additional tests after significant infrastructure changes, new application deployments, or cloud migrations. Cyber Essentials Plus requires an annual technical audit. Many cyber insurance policies and enterprise supplier contracts now specify annual or bi-annual penetration testing.

A vulnerability scan is an automated tool that identifies known vulnerabilities — it takes minutes and produces a list of potential weaknesses but does not verify exploitability. A penetration test involves skilled human testers who attempt to exploit vulnerabilities in combination, chain weaknesses together, and demonstrate real-world business impact. Only a pen test tells you what an attacker could actually achieve.

An external infrastructure pen test for a small business typically takes 1–3 days of testing plus 1–2 days to write the report. The report includes an executive summary, risk-rated findings (Critical/High/Medium/Low), detailed technical evidence for each finding, and remediation recommendations. Speedster IT provides a re-test after remediation to confirm fixes.

Yes. Speedster IT provides penetration testing London businesses trust, including external infrastructure, internal network, web application and cloud security testing, with a full re-test included after remediation.