The United Kingdom has one of the most mature penetration testing markets in the world, underpinned by CREST accreditation, the NCSC-run CHECK scheme for government systems, and CBEST threat-led testing for financial institutions regulated by the Bank of England. UK buyers benefit from a deep pool of accredited providers, but that also means more noise to cut through when shortlisting.
When choosing a UK provider, look for CREST accreditation as a baseline, CHECK approval if you are testing government or public-sector systems, and CBEST or TIBER-EU experience for regulated financial services. The providers below all operate in the UK market; the list opens with our Featured partner, clearly labelled, followed by the wider editorial directory ordered by accreditation depth and verified capability.
Related: UK providers: Q3 2026 edition · CREST pen testing companies · CHECK pen testing companies · CBEST-accredited companies
UK offensive security consultancy delivering CREST-accredited penetration testing, adversary simulation and CBEST, TIBER-EU and TBEST threat-led testing, mainly for financial services and other large organisations.
Global Big Four professional services firm delivering CREST, CHECK, and CBEST-accredited penetration testing and red teaming services from London, serving the UK's largest enterprises and regulated organisations.
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.
CREST and CHECK-accredited UK penetration testing and managed security provider formed in 2026 from Pentest People, Bulletproof, and Target Defense, with CREST STAR/TLPT-FS capability and the GuardNest vulnerability management platform.
CREST-accredited UK penetration testing consultancy based in Shropshire, delivering web application, API, infrastructure, cloud, mobile, and AI/LLM testing. A small specialist team, with a retest included in every engagement.
Elite UK offensive security consultancy specialising in CBEST/STAR/TIBER red teaming, advanced adversary simulation, and CREST-accredited penetration testing for FTSE 100 clients.
Full-service London-based cybersecurity consultancy with CREST, CHECK, and NCSC accreditations delivering offensive testing, managed detection, and strategic advisory services.
Manchester-based independent cybersecurity consultancy with over 20 years of experience delivering CREST and CHECK-accredited penetration testing, red teaming, and compliance certification services.
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.
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.
Award-winning Cheltenham-based cybersecurity consultancy with NCSC CHECK Green Light status and CREST approval, specialising in defence, government, and critical national infrastructure security.
CREST and CHECK-accredited European managed services provider delivering penetration testing with deep infrastructure and cloud hosting expertise.
CREST accreditation is the baseline standard for commercial UK penetration testing. For government and public-sector systems, look for CHECK approval, run by the NCSC. For intelligence-led red teaming of financial institutions, CBEST is the Bank of England's framework. ISO 27001 and Cyber Essentials Plus are common supporting certifications.
A focused UK web application or external network pen test typically costs between £4,000 and £12,000. Larger infrastructure engagements and red teaming run higher, with CBEST and TIBER-EU programmes reaching £50,000 or more. Day rates for UK CREST-accredited consultants typically range from £900 to £1,500.
Yes. The strongest UK providers have direct experience with FCA operational resilience expectations, CBEST intelligence-led testing for Bank of England-regulated firms, and DORA for firms with EU exposure. SECFORCE, our Featured partner on this page, specialises in CBEST and TIBER-EU threat-led testing for UK financial services.
CREST accredits commercial penetration testing services and is the most widely recognised standard for UK businesses. CHECK is a UK government scheme operated by the NCSC specifically for testing government and public-sector systems. Many UK firms hold both; CHECK companies must also maintain CREST accreditation.