Sentinel42 Ltd
UK information security & AI governance consultancy — fractional CISO, ISO 27001, GRC & audit services
Technology, Information and Internet · London, United Kingdom · small employees · Founded 2026
Sentinel42 Ltd is a UK-based information security and AI governance consultancy founded by Simon Green, a CISM-certified practitioner with 16+ years of experience across GRC, audit, and fractional CISO engagements.
We help organisations achieve and maintain compliance across ISO 27001, SOC 2, ISO 42001, PCI DSS, DORA, NIS2, GDPR, Cyber Essentials, and NCSC CAF — with hands-on delivery, not just templates.
Services include fractional CISO and virtual DPO, ISO 27001 / ISO 42001 implementation and certification, GRC consultancy, risk assessment and policy development, penetration test remediation support, and audit readiness programmes.
We work with start-ups, scale-ups, SaaS vendors, NHS organisations, and regulated businesses across financial services, energy, and technology sectors.
Referred by someone in your network? We run a referral programme — introductions that lead to a successful engagement are rewarded. Get in touch to find out more.
Specialties: ISO 27001, GRC, Fractional CISO, Information Security, Risk Management, ISO 42001, GDPR, Cyber Essentials, PCI DSS, DORA, NIS2, NCSC CAF, SOC 2, AI Governance