Penetration Testing Providers in United Kingdom
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.
Featured Local Specialists
Providers headquartered in United Kingdom, ranked by overall score. These local firms often bring deeper market context and language coverage than global competitors.
Top Accreditations in United Kingdom
Popular Services in United Kingdom
Compliance Expertise in United Kingdom
Editor’s Pick
Top-ranked in United Kingdom
NCC Group
Global cybersecurity consultancy with CREST, CHECK, and CBEST accreditation, renowned for deep technical research and comprehensive penetration testing services.
NCC Group
Global cybersecurity consultancy with CREST, CHECK, and CBEST accreditation, renowned for deep technical research and comprehensive penetration testing services.
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.
Nettitude
CREST, CHECK, and CBEST accredited UK consultancy within Lloyd's Register, delivering premium penetration testing for government and critical infrastructure.
Pen Test Partners
The UK's largest independent security testing firm, renowned for IoT/OT research, CBEST red teaming, and CHECK/CREST-accredited penetration testing across all sectors.
PwC Cyber Security
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.
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.
MDSec
Elite UK offensive security consultancy specialising in CBEST/STAR/TIBER red teaming, advanced adversary simulation, and CREST-accredited penetration testing for FTSE 100 clients.
Secarma
Manchester-based independent cybersecurity consultancy with over 20 years of experience delivering CREST and CHECK-accredited penetration testing, red teaming, and compliance certification services.
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.
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.
Penetration Testing in United Kingdom, FAQs
How do I find a penetration testing provider in United Kingdom?+
We currently list 32 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.
What accreditations should I look for in United Kingdom?+
Of the 32 providers listed for United Kingdom, 29 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.
How much does penetration testing cost in United Kingdom?+
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.