About
Built by someone who audits ISO 27001 for a living
Sentinel42 Ltd is a UK cyber and AI advisory company. We built ISMS27001 because first-time startups kept asking the same thing: "how do we get certified without hiring three consultants and buying enterprise GRC?"
About the Founder
Simon Green
Simon Green is the founder of Sentinel42 Ltd, a security, risk and governance consultancy helping organisations build confidence in how they protect systems, data and customers.
Simon brings senior experience across security leadership, compliance, audit readiness, supplier assurance, data protection and incident preparedness. His work focuses on turning complex security expectations into clear, practical actions that support trust, resilience and commercial confidence.
Through Sentinel42 Ltd, Simon provides pragmatic and evidence-based security guidance for organisations that want stronger governance, clearer risk decisions and assurance that stands up to customer, auditor and stakeholder scrutiny.
Credentials
- ISO/IEC 27001 Lead Auditor
- ISO/IEC 27001 Lead Implementer
- ISO/IEC 42001 Lead Auditor
- ISO/IEC 42001 Lead Implementer
- CISM — Certified Information Security Manager
- CCSK — Certificate of Cloud Security Knowledge
- Cyber Essentials Assessor
- UK SC cleared
Why we built this
Every audit engagement started the same way: a folder of half-finished policies, a spreadsheet risk register, and evidence scattered across four tools. The startup had spent months and five figures on consultants — and still couldn't answer "prove control A.5.15 works".
Enterprise GRC tools solve this for enterprises. They're too heavy, too expensive, and too configurable for a ten-person startup that just needs to pass Stage 1.
ISMS27001 is the middle ground: opinionated defaults based on how the standard is actually audited, priced so founders can afford it, with the audit-log guarantees an assessor expects to see.
Company
- Legal entity
- Sentinel42 Ltd
- Companies House
- 17286468 (England & Wales)
- ICO registration
- C1974552
- Registered office
- 66 Paul Street, London EC2A 4NA
Talk to us
Questions about ISO 27001, the platform, or whether we're a fit? Email is the fastest way in.