Cyber attacks cost UK businesses billions every year. Finding the best cyber security consultant in the UK is not just about ticking compliance boxes. It is about protecting your business from real threats.

The right consultant will understand your specific risks and build defences that actually work for your organisation.

I have been in cyber security for over 25 years. I have seen attacks that could have been prevented and breaches that happened despite expensive security tools. The difference is usually the quality of advice.

Whether you need a full cyber security strategy or specific testing and assessments, the consultants below represent the best in the UK for 2026.

What to Look For in a Cyber Security Consultant

  • NCSC certified or CREST accredited
  • Works with businesses your size, not just enterprises
  • Explains risks in business terms, not technical jargon
  • Has incident response experience, not just theory
  • Offers fractional or retainer options for ongoing support

Here is our roundup of the best cyber security consultants in the UK for 2025.

1. Paul Reynolds

A multi-vendor consultant with over 25 years of experience across multiple sectors. I hold CISSP, CSTM, and multiple cloud certifications with Azure and AWS.

I provide cyber security consulting for businesses in regulated industries including FinTech, Financial Advisors, Accountancy, HealthTech, and Legal.

My approach is practical and focused on real risks. I explain things in plain English and work directly with you to build security that fits your business, not generic solutions that do not work.

2. Your Digital CTO

A fractional CTO service offering technology leadership and security governance for growing businesses. They combine strategic guidance with practical cyber security support.

Their services include gap analysis, security testing, penetration testing, and ongoing technology governance. A good option for businesses wanting strategic and tactical support together.

3. Secarma

A UK consultancy known for personalised technical consulting rather than generic methodologies. They specialise in security assessments, red teaming, and penetration testing.

Secarma works with clients who want a customised consulting relationship rather than off-the-shelf solutions. A good choice for businesses needing tailored security advice.

4. NCC Group

One of the largest cyber security consultancies in the UK with a global presence. They offer penetration testing, threat intelligence, and managed security services.

NCC Group holds CREST and CHECK certifications. They work across all sectors and are a good choice for organisations needing comprehensive security assessments.

5. Bridewell

An NCSC Certified consultancy offering more NCSC assured services than any other company. They specialise in Azure security and Microsoft 365 environments.

Bridewell offers managed detection and response, penetration testing, and security architecture services. A strong choice for mid-market businesses on the Microsoft stack.

6. Redscan (Kroll)

A managed detection and response specialist now part of Kroll. They provide continuous monitoring and threat detection services for UK businesses.

Their services include MDR, incident response, and security assessments. A good option for businesses wanting ongoing operational security support.

7. Adarma

A UK-based cyber security consultancy focused on threat management and security operations. They provide managed SOC services and incident response.

Adarma works with organisations across regulated industries and has a strong reputation for threat intelligence and proactive defence.

8. Context (Accenture)

A highly respected technical consultancy now part of Accenture. They specialise in penetration testing, red teaming, and security research.

Context is known for deep technical expertise and works with organisations requiring advanced security testing and research capabilities.

9. WithSecure

A Finnish company with a strong UK presence, formerly known as F-Secure. They provide consulting, managed services, and endpoint security solutions.

WithSecure offers penetration testing, security assessments, and incident response. They combine consulting services with their own security technology.