# Brian Stephens — Full Site Content # https://brianstephens.co.uk | llms-full.txt # Plain-text representation of all site content for LLM crawlers that do not execute JavaScript. # Updated: April 2026 --- ## Homepage ### Identity Brian Stephens — Principal Cyber Security Consultant SC Cleared · CNI Experienced · Regulated Environments 25+ years of experience https://brianstephens.co.uk ### Hero Summary I help regulated organisations build defensible security postures — from board-level strategy to technical implementation across Cloud, M365, and critical infrastructure environments. Specialisms: Audit-ready Governance · Audit & M365 Assurance · AI Security Governance · Supply Chain Risk · Board-level Advisory · Secure by Design · Incident Readiness · Security Architecture ### Services **Cloud Security Architecture** Independent assurance of Azure and M365 environments — from secure-by-design architecture, zero-trust implementation, and identity governance to Defender suite optimisation, AI security controls, and cloud native guardrails. **GRC (Governance, Risk & Compliance)** Building governance frameworks that produce defensible, auditable security postures — not paper compliance. Risk registers, policy architecture, and control validation that hold under external scrutiny. **Critical Infrastructure Assurance** Independent security assurance for nuclear, electricity, and oil & gas environments — protecting national interests and critical systems against emerging threats where IT/OT convergence, regulatory accountability, and safety-critical proportional mitigations demand a fundamentally different approach. **Audit & Control Validation** Producing the evidence that satisfies internal audit, regulatory assessment, and certification bodies (ISO 27001, Cyber Essentials+, CAF, ONR SyAPS, CIS controls) — structured, defensible, and built to withstand scrutiny. **Threat Detection & Response** KQL-driven detection engineering across Microsoft Sentinel and Defender — translating telemetry into actionable intelligence and keeping detection logic ahead of evolving threats. **Board-Level Security Advisory** Translating complex security risk into language boards act on — clear priorities, credible threat narrative, and strategic roadmaps aligned to business risk appetite. ### Consulting Philosophy — Strategy Grounded in Technical Reality Regulated organisations face a growing gap between compliance obligations and operational security reality. Independent consultancy closes that gap — not by adding process, but by building security postures that hold under scrutiny: from the regulator's desk to the board table to the OT control room floor. **01 — Outcomes over outputs** Security programmes that satisfy auditors but fail under real pressure are not security programmes — they are risk. Every engagement I lead is designed to produce controls and governance that hold under scrutiny, not just on paper. **02 — Technical depth enables strategic advice** Independent consultancy is most valuable when the advisor can operate at both board level and implementation depth. I translate between those layers — which means the strategy is grounded in what is technically achievable, and the technical delivery is aligned to genuine business risk. **03 — Defensibility is the standard** In regulated and CNI environments, security posture must be demonstrably defensible — to regulators, auditors, insurers, and boards. That standard shapes every risk register, architecture decision, and governance artefact I produce. ### Platform & Technical Depth **Architecture & DevSecOps** Secure-by-design delivery, threat modelling (STRIDE), DevSecOps integration, cloud native guardrails, IaC scanning, secure by default engineering, hybrid and cloud platforms security **Cloud & Identity** Azure Security Center, Microsoft Sentinel, Defender for Cloud, Defender for Endpoint, Entra ID / PIM, Conditional Access, Microsoft Purview, DLP & Intune MDM, M365 Copilot security, NCSC Cloud Principles **GRC & Frameworks** ISO 27001, ISO 27005, NIST CSF, CAF (NCSC), ONR SyAPS, CIS controls, Cyber Essentials Plus, NIS2 / UK CSR Bill, Third-party SRA, SABSA principles, Risk register design **Detection & Response** KQL (advanced), Microsoft Sentinel, Tenable One, Carbon Black EDR, Splunk SIEM, Azure Monitor, Log Analytics, IR plan design, Threat hunting **CNI & OT Security** IT/OT convergence, Purdue model, OT risk assessment, ONR regulatory assurance, ICS/SCADA governance, Nuclear (Sizewell C), Northern Powergrid CNI, Oil & Gas CNI, SC Cleared delivery **Network & Infrastructure** Zero-trust architecture, network segmentation, container & API security, encryption standards, Cisco firewall estate, VPN design & migration, IDS/IPS architecture, Hybrid estate security, Active Directory hardening, CIS benchmark hardening ### Client Projects (Experience) **Cyber Security Specialist — Sizewell C (Nuclear CNI)** Engaged to provide independent cybersecurity assurance at the UK's flagship nuclear energy project. Delivered Cyber Essentials Plus certification within a two-week window. Responsibilities included security reviews, risk assessments, audit evidence, compliance alignment (ONR SyAPS), and SC Cleared delivery in a highly regulated environment. **Security Consultant — Northern Power Grid (Electricity CNI)** Delivered endpoint security controls within an OT pre-production environment using Carbon Black EDR. Authored HLD/LLD security designs. Delivered tailored application control baselines and custom EDR rule sets. Mentored internal teams on secure operations post-project handover. **Infrastructure Security Consultant — Ineos Oil & Gas** Delivered a NIST-aligned cyber security programme across IT and OT infrastructure. Oversaw onboarding of MSSP and SIEM (Dell SecureWorks). Deployed enterprise EDR, DNS security (Carbon Black, Cisco Umbrella), and IAM controls (OKTA). Azure and O365 security architecture with hardened image deployments and automated patching. Projects completed during global COVID shutdown. **Infrastructure Security Engineer — Kobalt Music Publishing (Media & Entertainment)** Deployed global EDR and SIEM (Carbon Black, Splunk). Onboarded IAM (OKTA) and drove secure integration with AWS, Confluence, and JIRA. Hardened systems using CIS benchmarks. Developed global security policies, procedures, and vulnerability management processes. **Network Systems Analyst — ACCOR Hotels UK & Ireland (Global Hospitality)** Delivered secure infrastructure across 250+ sites during a major digital transformation. PCI DSS compliance across UK & European hotel networks. Migrated legacy Exchange to Office 365. Decommissioned legacy VPNs and coordinated secure firewall upgrades across 200+ Cisco devices. Implemented PowerShell scripting, patching automation, and compliance monitoring. ### Contact Brian Stephens is available for regulated organisations, CNI operators, and complex GRC programmes requiring senior, independent cybersecurity expertise. Contact: https://brianstephens.co.uk/#get-in-touch LinkedIn: https://www.linkedin.com/in/b-stephens/ --- ## Case Studies ### Cyber Essentials Plus Certification — Sizewell C Nuclear **Category:** Risk Management **Sector:** Critical National Infrastructure **Client:** Sizewell C **Duration:** 2 Weeks **Date:** March 2026 **Engagement Type:** Independent Consultant **Technologies:** Microsoft Defender for Endpoint, Microsoft 365, IASME Consortium CE+ Scheme, UK Government Cyber Essentials **URL:** https://brianstephens.co.uk/case-studies/cyber-essentials As Lead and Delivery Consultant engaged by Sizewell C, I was responsible for shepherding one of the UK's most significant nuclear energy projects through Cyber Essentials Plus certification. The assessment had to be completed within a demanding two-week timeframe without disrupting live project operations. I adopted a structured and phased approach—beginning with scoping, gap analysis against the five CE+ technical controls, and direct collaboration with internal IT teams to address gaps swiftly. Certification was delivered with zero disruption, providing independent assurance of security controls against a government-backed standard. Crucially, this mitigates exposure to commodity cyber attacks by up to 99% and establishes a posture validated by industry data to reduce cyber insurance claim likelihood by 92%. My prior experience in CNI environments and direct relationship with IASME enabled me to navigate the process with zero ramp-up time. --- ### Azure Security Architecture **Category:** Architecture **Sector:** Cloud & Enterprise **URL:** https://brianstephens.co.uk/case-studies/azure-security-architecture Independent security architecture review and design for an Azure and M365 environment. Covering secure configuration, identity governance (Entra ID / PIM), Defender suite optimisation, and AI security controls. --- ### Compliance Mapping **Category:** Compliance **URL:** https://brianstephens.co.uk/case-studies/compliance-mapping Framework alignment and evidence mapping against ISO 27001, NIST CSF, and CAF (NCSC). Producing structured, defensible audit evidence packs for regulatory and certification assessment. --- ### IAM Framework **Category:** Identity **URL:** https://brianstephens.co.uk/case-studies/iam-framework Identity and Access Management framework design and implementation. Covering Entra ID, PIM, Conditional Access, and zero-trust access controls for a regulated enterprise environment. --- ### IT Health Check **Category:** Risk Management **Sector:** Critical National Infrastructure **Client:** Sizewell C Nuclear **Duration:** 2 Weeks **Date:** January 2026 **Engagement Type:** Independent Contractor **Technologies:** NCSC CHECK, CREST, NIST Cybersecurity Framework, ISO 27001, Penetration Testing **URL:** https://brianstephens.co.uk/case-studies/it-health-check As Lead Consultant engaged by Sizewell C, I facilitated a comprehensive IT Health Check (ITHC) to provide objective, external validation of the project's cybersecurity trajectory. Partnering with external CREST-accredited specialists, I led a rigorous, intelligence-led evaluation aligned firmly with NCSC CHECK guidance. I benchmarked the organisation's cybersecurity posture above the industry average and produced a prioritised, risk-weighted remediation roadmap. Crucially, this proactive vulnerability identification delivers an estimated 10:1 ROI by mitigating the £195k average UK breach cost, whilst rapidly reducing internal Mean Time To Remediate (MTTR) and establishing the evidence required to negotiate cyber insurance premium reductions. --- ### Risk Assessment Matrix **Category:** Risk Management **URL:** https://brianstephens.co.uk/case-studies/risk-assessment-matrix Risk register design and control validation. Building a structured, board-ready risk assessment framework aligned to the organisation's risk appetite and regulatory obligations. --- ### Microsoft Security Copilot Integration — AI-Augmented SOC **Category:** AI Security **Sector:** Financial Services **Client:** Major Financial Services Enterprise **Duration:** 6 Months **Date:** February 2029 **Engagement Type:** Independent Contractor **Technologies:** Microsoft Security Copilot, Microsoft Defender XDR, KQL, MITRE ATT&CK Framework, Sentinel **URL:** https://brianstephens.co.uk/case-studies/security-copilot-diagram As Lead Consultant for a major financial services enterprise, I engineered a seamless Microsoft Security Copilot integration directly into the existing Incident Response playbook. I architected the workflow to empower Tier 1 analysts to perform Tier 2-level forensic and malicious script analysis using AI-assisted natural language queries. This AI augmentation scaled the SOC's capability without additional headcount, delivering a 30% reduction in Mean Time To Resolution (MTTR) and accelerating incident triage by nearly 40%. By mapping Copilot queries directly to the MITRE ATT&CK framework, the deployment was proven to confidently position the organisation to realise an estimated 99% to 348% ROI on their Copilot licensing investment. --- ### Threat Intelligence Dashboard **Category:** Monitoring **URL:** https://brianstephens.co.uk/case-studies/threat-intelligence-dashboard KQL-driven threat intelligence and detection engineering across Microsoft Sentinel. Building detection logic, monitoring dashboards, and actionable alert workflows for a regulated environment. --- ## AI Assistant Brian Stephens has an AI assistant available at https://brianstephens.co.uk/faq — trained on his cybersecurity expertise and engagement history. The assistant can discuss security challenges, explain how Brian approaches CNI and GRC engagements, and help prospective clients assess whether an engagement is the right fit before committing to a call. --- ## Credentials & Clearance - SC Security Clearance (active) — enables government, defence, and CNI programme delivery - Cyber Essentials Plus — assessor/implementor experience via IASME Consortium - ISO 27001 — implementation and audit evidence experience - NIST CSF — framework specialist - CAF (NCSC) — Cyber Assessment Framework implementation - ONR SyAPS — nuclear regulatory security framework - NIS2 / UK CSR Bill — compliance advisory --- ## Engagement Model Brian Stephens operates as an independent consultant — not a staffing agency, not a managed service. Clients engage directly with a senior practitioner. Best suited to: - Regulated organisations with complex GRC programmes - CNI operators requiring senior independent assurance (nuclear, energy, oil & gas) - Boards and leadership teams needing credible, board-level security advisory - Cloud environments (Azure / M365) requiring defensible security architecture and Defender suite expertise He is not the right fit for every project and will say so upfront. Contact: https://brianstephens.co.uk/#get-in-touch