Cyber Security
Penetration Testing Services
We identify exploitable vulnerabilities through independent penetration testing, giving you practical insight to strengthen security before weaknesses become operational or financial risks.
Prefer to talk? Call 020 4634 2518 · Rated 5.0 on Google · UK-wide coverage
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- Customer satisfaction
- 100%
- Years of combined experience
- 35+
- Average first response
- 9 min
The problem
Security controls should be tested, not assumed
Attackers only need one overlooked weakness to gain access. Vulnerabilities often hide beneath the surface of well-functioning security infrastructure, invisible until someone goes looking for them.
Independent testing gives you an honest, real-world view of where your defences hold and where they don’t, so you can fix the gaps that matter most.
Testing is scoped around what your business actually runs, and the findings come back as a prioritised list of fixes with the remediation work available from the same team. It is priced per user at a fixed monthly cost rather than bundled into rigid packages, so it scales with your team. Everything runs through the same UK service desk that handles your day-to-day tickets, so there is no separate team to chase. Across 2025 our average first response time was 9 minutes and our average resolution time was 6 hours, measured across every ticket we handled.
Cyber SecurityPenetration Testing
Common risks we uncover
- Internet-facing systems with exploitable vulnerabilities
- Weak authentication controls protecting business applications
- Misconfigured Microsoft 365 and cloud services
- Outdated software containing known security weaknesses
- Excessive user permissions across internal systems
- Network segmentation issues allowing unnecessary access
Certified & accredited
Credentials you can check
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Cyber Essentials certified
Independently assessed against the UK government-backed scheme, so our security fundamentals are verified rather than simply claimed. We help clients certify too. How Cyber Essentials helps you -
Microsoft Cloud Solution Provider
A direct partnership with Microsoft. We license, deploy and support Microsoft 365 and Azure for you, with escalation straight to Microsoft when it is needed. Our Microsoft cloud services
Cyber Essentials is a UK government scheme run by the National Cyber Security Centre, delivered by IASME. You can verify what the certification covers at source.
Our approach
Assessing security from a real-world perspective
A structured methodology that mirrors how genuine attackers probe your environment.
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Assessing external security
We test the internet-facing systems attackers see first, identifying exposed services and exploitable weaknesses.
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Reviewing internal security
We evaluate what an attacker could do once inside, from lateral movement to privilege escalation.
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Evaluating cloud & Microsoft 365
We review cloud and Microsoft 365 configuration for the misconfigurations that quietly widen your attack surface.
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Validating security controls
We confirm your existing defences actually work as intended against real-world techniques.
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Prioritising improvements
We rank findings by business impact so you fix what matters most, first.
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Supporting long-term resilience
We help you build security that keeps pace with your business, not just a one-off report.
No obligation
Not sure where to start?
Tell us what is not working and we will tell you what we would do about it. No pressure and no jargon.
Working with Billy and the WhizzIT team has been a revelation. Amazing support in set up, outstanding customer service and a pleasure at every interaction.
What we deliver
Testing built around real business risk
Every engagement is scoped to your environment and delivered in plain English, with clear evidence and practical next steps, not a jargon-filled report that gathers dust.
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External & internal penetration testing
Simulated attacks against your perimeter and internal network to surface the paths a real intruder would take.
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Web application & Microsoft 365 testing
Deep testing of business-critical applications and cloud services where sensitive data lives.
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Reporting & remediation guidance
Clear risk prioritisation and practical, step-by-step guidance your team can act on.
- Independent validation of existing security controls
- Identification of exploitable vulnerabilities before attackers find them
- Better visibility into business-critical cyber risks
- Recommendations prioritised by business impact
- Support for compliance and security assurance requirements
- Improved confidence in your overall cyber security posture
Case study
Helping an engineering consultancy validate its cyber security
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The problem
Security had never been independently assessed.
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Our action
We simulated real-world attack techniques across external infrastructure, Microsoft 365, remote access services and internal networks.
- 24%
- Less admin time on IT issues
- 21%
- Better staff efficiency
- 4×
- Visibility across locations
- 5 mo
- To measurable results
Expertise you can trust
Why businesses trust WhizzIT with penetration testing
WhizzIT operates with 30+ years of combined IT experience, supporting 350+ users, managing 500+ business devices and resolving over 2,000 support requests every year.
- 30+ years combined experience
- 350+ users supported
- 500+ devices managed
- 2,000+ requests resolved a year
Great IT support company. The WhizzIT team are professional, responsive and easy to work with. It’s reassuring to know we can rely on them.
Good to know
Penetration testing FAQs
Not covered here? Ask us directly — same working day response.
020 4634 2518What is penetration testing?
Penetration testing is an authorised, simulated attack on your systems that safely uncovers exploitable weaknesses, external, internal, cloud and application, so you can fix them before a real attacker finds them.
How often should we run a penetration test?
Most businesses test at least annually, and after any significant change such as a migration, new application or office move. We’ll help you set a cadence that matches your risk profile and compliance needs.
Will testing disrupt our business?
No. Testing is carefully scoped and scheduled around your operations. Our goal is to surface risk safely, without impacting your team or your customers.
What do we get at the end?
A clear report written in plain English, with findings prioritised by business impact and practical, step-by-step remediation guidance your team can act on, plus support to help you close the gaps.
Technology partners
Brands we partner with
We hold partner status with the vendors behind the tools we deploy, so your licensing, support and escalation come direct from the source rather than through a reseller chain.
