Europe
UK-based penetration testing providers, many holding CREST, CHECK, and CBEST accreditations recognised by the National Cyber Security Centre (NCSC).
The UK has one of the most mature pen testing markets globally, with providers serving financial services under CBEST, government under CHECK, and commercial organisations across all sectors.
UK organisations operate under a distinctive mix of frameworks, CREST and CHECK for government-adjacent work, CBEST for major financial institutions regulated by the Bank of England, and NCSC guidance across critical national infrastructure. Providers here routinely serve financial services, government, and enterprises in London, Manchester, and Edinburgh, with expertise spanning everything from assumed-breach engagements to red-teaming aligned with TIBER-EU.
Most relevant: CREST-accredited pen testing providers.
Browse penetration testing providers by area within United Kingdom.
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.
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.
Boutique UK penetration testing consultancy in Milton Keynes specialising in manual, expert-led security assessments across web applications, APIs, cloud, and mobile platforms.
Cybersecurity consulting division of global insurance leader Aon, uniquely combining penetration testing with cyber risk quantification and insurance expertise.
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.
Fast-growing CREST and CHECK-accredited UK cybersecurity consultancy with deep expertise in critical national infrastructure sectors.
CREST and CHECK-accredited European managed services provider delivering penetration testing with deep infrastructure and cloud hosting expertise.
Edinburgh-based CREST-accredited IT and cybersecurity firm. Pen testing for Scottish public sector, financial services, and commercial clients.
Subscription-based offensive cybersecurity firm delivering continuous cyber attack services with CREST STAR and CBEST accreditations from its London headquarters.
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.
Cardiff-based CREST and CHECK-accredited cyber security company delivering penetration testing, red teaming, and OT security assessments as part of the Chess Group.
CREST-accredited Manchester-based cyber security firm delivering penetration testing, managed security services, and compliance consultancy across the UK, Europe, and the USA.
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.
We currently list 29 penetration testing providers serving United Kingdom. You can filter by service type, accreditation, compliance expertise, and pricing to find the best fit for your requirements. Each provider profile includes verified accreditations, service details, and independent scores based on our transparent methodology.
Of the 29 providers listed for United Kingdom, 26 hold CREST accreditation, the most widely recognised standard for penetration testing quality in the Europe region. For European organisations, look for providers with ISO 27001 certification and expertise in GDPR, NIS 2, and DORA compliance.
Penetration testing costs in United Kingdom vary significantly based on scope and complexity. A standard web application test typically ranges from £5,000 to £25,000, network penetration tests from £10,000 to £30,000, and comprehensive red team engagements from £30,000 to over £100,000. Key cost factors include the number of targets, required accreditations, testing methodology, and whether on-site presence is needed. See our general pricing guide for more detail.