• SITE SURVEYS & ATTACK TRIALS

    Our team will analyse the effectiveness of your current security measures.

    Propose new specifications, or test new systems.
    Site Survey
  • COUNTER-MEASURE GUIDANCE

    After identifying and agreeing threats, D-Four will prepare Operational Requirements and suggest appropriate counter-measures.

    Call us on: +44 (o)7704 421150
  • PROCUREMENT SUPPORT

    D-Four can support clients during procurement or act as an intelligent client during projects and installations

    Contact Us

About D-Four

asc D-Four was formed in late 2011 to meet the growing requirement in the public and private sector for experienced, independent, unbiased protective security guidance for high-value sites and assets.

The company was formed by Derek McDonald who was, until 2011, employed as Senior Protective Security Advisor, with the Protective Security Advisory Team (PSAT), Security Services Group (SSG), MoD.

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These are just some of the clients that D-Four has worked with:

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