Penetration Testing for London Businesses: How Our Team Works

London is one of the most attractive targets for cyber attackers in the world, and the numbers back it up. The government's Cyber Security Breaches Survey 2025 found that 43% of UK businesses, around 612,000 organisations, suffered a breach or attack in the past year. For a capital dense with financial services, professional firms and fast-scaling technology companies, the question is not whether you will be probed, but whether you will find the weaknesses before someone else does. Here is how our team works with London clients to make sure it is us, not an attacker.

Why London businesses are in the firing line

Phishing remains the most common threat, affecting 38% of businesses, and ransomware attacks doubled year on year. Larger organisations are hit hardest: 65% of medium and 69% of large businesses reported a breach. London concentrates exactly the kind of high-value data and customer-facing systems that attackers want, which makes proactive testing less of a nice-to-have and more of a basic control.

How we work with London clients

Good penetration testing is a clear, transparent process, not a black box. Our engagements follow the same path every time.

1. Scoping. A free scoping call maps your systems, the realistic threats you face and what matters most, then produces a fixed, costed plan with no surprises.
2. Testing. We simulate real-world attacks against the agreed scope, by hand and with tooling, chaining weaknesses the way an attacker would rather than just running a scanner.
3. Reporting. You get a prioritised report with proof of each finding, business impact in plain English and clear remediation steps your engineers can act on.
4. Fix and free retest. Once you have fixed the issues, we retest the findings free of charge within six weeks, so you can prove the risk is actually closed.

What we test

We cover the systems London businesses actually run on:

• Web application penetration testing for the platforms and portals your customers use.
• Mobile application penetration testing across iOS and Android and their backends.
• API penetration testing for the authentication, authorisation and data-exposure flaws behind modern apps.
• Network penetration testing for your internal and external infrastructure.

Because we also build production software and AI systems, we test the way things really break, including newer risks such as AI features and the data pipelines behind them.

Why local matters

Working with a team that understands the London market means faster scoping, easier on-site access when a test needs it, and a partner in your timezone when something urgent comes up. We work with clients across London and the wider UK, from first scoping call to secure launch.

Frequently asked questions

How much does penetration testing cost in London?

It depends on the size and complexity of what is in scope. We provide a fixed quote after a free scoping call, so the price is agreed up front with no surprises.

How long does a penetration test take?

Most single-application tests run over a few days to a couple of weeks depending on scope. We agree the timeline during scoping.

Do you retest after we fix the issues?

Yes. We retest the findings free of charge within six weeks so you can prove the risks are closed.

Want London-based penetration testing with fixes and a free retest? Arrange a call with our team.