Defence Security Controller

• Incident Management & Resilience

Mott Mac Donald is a global engineering, management, and development consultancy with over 20,000 employees across more than 50 countries and 140+ offices.

We work across incredible global industries, delivering exciting work that is defining our future and making an important societal impact in the communities we serve. Our people power our performance – we succeed when they do. With countless opportunities to collaborate, learn, and grow, the possibilities for excellence are as varied as every individual.

Whether you want to grow as a subject matter expert or broaden your experience with roles across our international community, you’re surrounded by global specialists who want to combine their expertise and champion you to be your best. As a proudly employee-owned business, we benefit our clients, our communities, and each other, investing in creating the right space for everyone to feel empowered, included, and valued.

Whatever your ambition, Mott Mac Donald is where people come to be brilliant.

The Buildings Unit (BLD) has a major presence in Mott Mac Donald’s regional offices throughout the UK and mainland Europe, providing a wide range of diverse and transferable cross-sector skills across five key Sectors;
Advisory, Built Environment, Energy, Transportation and Water. We also provide local services to customers and technical leadership to the rest of the Group in these sectors.

The Defence Security Controller is a key member of the Defence and Civil Nuclear Team, providing expert security leadership and assurance to major MM Defence projects in the Preston area. The role delivers project, programme, and corporate-level security oversight to ensure the protection of HMG classified, sensitive aviation, and regulated assets, while maintaining compliance with UK Government and MOD requirements.

The post holder will act as Project Security Controller for assigned programmes, supporting business growth, contract delivery, and regulatory compliance across Defence portfolios.

• Defence & Project Security
  • Act as Project Security Controller for major MM Defence programmes, providing proportionate security assurance across the project lifecycle
  • Interpret, implement and monitor security controls to protect HMG-classified assets in line with contractual, legislative and policy requirements
  • Ensure compliance with GovS 007, legacy Security Policy Framework (SPF) requirements and relevant MOD Joint Service Publications
  • Provide security advice to Project Sponsors, Programme Managers and Project Managers, including attendance at project kick‑off meetings
  • Oversee the development, approval and maintenance of Security Management Plans (SMPs) and Project Security Strategies
• IT & Information Security
  • Act as Defence IT Security Officer (ITSO) for assigned programmes
  • Manage and process Cyber Security Model (CSM), Secure by Design (SbD) and Data Protection Impact Assessment (DPIA) submissions
  • Advise on information classification, aggregation, secure IT systems and information-sharing arrangements, including FSNs and ISNs
  • Contribute aviation security expertise to bids and proposals to strengthen MM’s right to win
• Corporate Security & Governance
  • Maintain and update Corporate Security Instructions, ensuring accessibility and compliance with Defence and aviation security requirements
  • Support security planning for new contracts, office relocations/refurbishments and facilities handling classified or aviation-regulated assets
  • Maintain the Defence Security Risk Register, aligned to Group Risk Management policy
  • Support internal and external…