Security Controller

Information Security Controller – Merthyr Tydfil, South Wales – Onsite, starting July 2026

Salary up to £35,000. The role reports into the Head of Security in Cambridge and is responsible for coordinating and assuring physical and operational security across Marshall Land Systems sites, with the primary operating location in Merthyr Tydfil.

Reporting into the Head of Security in Cambridge, the Security Controller will ensure compliance with defence security requirements and enable secure delivery of programmes, projects and supply chain activities. The role involves managing a small onsite team in Wales.

• Act as the primary day‑to‑day liaison at Merthyr Tydfil with external security authorities, including DE&S PSyA, UKSV, NCSC, WARP, and IVCO.
• Support the implementation and ongoing assurance of company security policies, processes, audits, reporting and incident response.
• Oversee physical security arrangements across the site, including access control, CCTV systems and building security in collaboration with Facilities.
• Ensure robust access control and visitor management processes are in place, consistently applied and compliant with required standards.
• Oversee the operation of security systems (CCTV, alarms, access control, incident management tools), ensuring effective monitoring and response.
• Provide direction, coordination and tasking to on‑site security personnel, maintaining situational awareness and effective site coverage.
• Ensure routine security checks, patrols and inspections are completed and meet required standards.
• Support the site Security Team, including recruitment, performance management and professional development.
• Support contract and programme delivery by managing security requirements, including Security Aspects Letters (SALs) and supply chain assurance.
• Support the coordination of site‑level IT service support, including the request, issue of IT equipment and act as a local point of contact for third‑party IT providers.
• Support and coordinate response to security incidents at the Merthyr Tydfil site, ensuring timely escalation, investigation and reporting in line with company and regulatory requirements.
• Support to Site Manager when required.

• Experience operating within a security role in a regulated or high‑security environment (e.g. defence, government or critical infrastructure).
• Proven experience managing physical security operations, including access control systems, CCTV and site security measures.
• Experience liaising with external security authorities (e.g. UKSV, NCSC, MOD or equivalent bodies).
• Demonstrable experience implementing and assuring security policies, audits and incident response processes.
• Leadership and development of the local security team.
• Experience supporting secure contract or programme delivery, including supply chain assurance and Security Aspects Letters (SALs).
• Supporting the coordination of operational security activities, including incident response and team tasking.
• Exposure to IT service coordination or support within a secure environment.

• Working knowledge of physical security systems, including CCTV, access control and alarm systems.
• Strong understanding of security operations, incident response and best practices.
• Ability to oversee and assure security processes, inspections and compliance activities.
• Competence in using security and incident management systems.
• Knowledge of UK Government security standards and frameworks.
• Security‑related professional qualification (e.g. Security Institute, ASIS or equivalent).
• Familiarity with IT service management principles (e.g. ITIL).

• Experience with in the defence sector or working on government contracts.

• Site‑based role. Candidates must be eligible to obtain and maintain UK Security Clearance (SC as a minimum).

• Play a central role in protecting critical defence programmes, national security interests and sensitive assets.
• Regular engagement with external authorities (UKSV, NCSC, MOD stakeholders) and participation in recognised security forums.
• Opportunities to gain and…