Best Red Teaming Companies in United Kingdom
28 red teaming providers serve United Kingdom clients. This list ranks them by accreditation depth, methodology, and editorial scoring. Red team engagements need providers with custom tooling, EDR-evasion experience, and threat-intelligence-driven scenario design, not just penetration testing rebranded. UK buyers should look for CREST accreditation, with CHECK-approved providers required for government work and CBEST for major financial institutions.
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SECFORCE
Canary Wharf-based adversary simulation and CBEST-aligned penetration testing consultancy, delivering CREST-accredited offensive security to UK financial services and other organisations with the most demanding requirements.
Aardwolf Security
Boutique UK penetration testing consultancy in Milton Keynes specialising in manual, expert-led security assessments across web applications, APIs, cloud, and mobile platforms.
Aon Cyber Solutions
Cybersecurity consulting division of global insurance leader Aon, uniquely combining penetration testing with cyber risk quantification and insurance expertise.
Aristi
CHECK and CREST-accredited Birmingham-based cyber security consultancy with over 15 years of experience delivering penetration testing, red teaming, and OT security assessments for government and private sector clients.
Bridewell
Fast-growing CREST and CHECK-accredited UK cybersecurity consultancy with deep expertise in critical national infrastructure sectors.
Bulletproof
CREST-accredited UK cybersecurity and compliance provider offering penetration testing, managed security services, and regulatory consultancy to over 2,000 customers from its Stevenage headquarters.
Claranet
CREST and CHECK-accredited European managed services provider delivering penetration testing with deep infrastructure and cloud hosting expertise.
CovertSwarm
Subscription-based offensive cybersecurity firm delivering continuous cyber attack services with CREST STAR and CBEST accreditations from its London headquarters.
Cyberis
CREST and CHECK-accredited UK penetration testing consultancy with CBEST approval, specialising in infrastructure, application, and simulated attack assessments across the public and private sectors.
CyberLab
Cardiff-based CREST and CHECK-accredited cyber security company delivering penetration testing, red teaming, and OT security assessments as part of the Chess Group.
Dionach
Global enterprise cybersecurity consultancy founded in 1999 in Oxford, holding rare CREST STAR-FS accreditation and delivering penetration testing, red and purple teaming, and PCI QSA services across five international offices.
Evalian
CREST-accredited UK cyber security and data protection consultancy offering penetration testing, ISO consultancy, and managed SOC services from offices across the UK and Ireland.
Best Red Teaming Companies in United Kingdom, FAQs
How do I find the best red teaming provider in United Kingdom?+
Start by shortlisting providers with verified red teaming experience and accreditations that match your industry. This page lists 28 providers offering red teaming to United Kingdom clients, ranked by accreditation depth, methodology, and editorial scoring. Compare scope, methodology, and pricing across at least three providers before committing.
What accreditations matter most for red teaming in United Kingdom?+
UK buyers should look for CREST accreditation, with CHECK-approved providers required for government work and CBEST for major financial institutions. On top of those, Red team engagements need providers with custom tooling, EDR-evasion experience, and threat-intelligence-driven scenario design, not just penetration testing rebranded.
How much does red teaming cost in United Kingdom?+
Red Teaming engagements in United Kingdom typically range from $5,000 to $50,000 depending on scope, complexity, and required accreditations. Boutique providers often start lower, while large consultancies and engagements requiring CREST, CBEST, or FedRAMP 3PAO accreditation sit at the higher end. Request fixed-scope quotes from at least three providers to benchmark fair market pricing.
How long does a red teaming engagement take in United Kingdom?+
Most red teaming engagements in United Kingdom run between 1 and 4 weeks of active testing, plus 1 to 2 weeks for reporting and remediation review. Larger or more regulated engagements (red team programmes, multi-environment cloud assessments) can extend to 6 to 12 weeks. Build buffer time into procurement schedules to allow for accredited tester availability.
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