Security & Defence Electronics Manufacturing

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Precision and Protection in Every Detail

NOTE UK is one of the UK’s leading contract electronics manufacturers for the defence and security sector, operating through STI NOTE, and Kasdon, a NOTE company in Wolverhampton – more than 350 defence electronics specialists across three UK sites, covering the air, land, cyber and marine domains. AS9100, IPC Class 3, ISO 27001 and List X certified.

NOTE security and defence
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The UK’s leading defence electronics capability

NOTE’s acquisition of STI has created one of the most significant defence electronics manufacturing operations in the UK. STI NOTE, a NOTE Defence company, brings approximately 300 staff and c.£60 million in revenue across two dedicated defence sites at Hook and Poynton – specialist electronics manufacturing for prime contractors and the MOD, with a programme history spanning decades. Combined with Kasdon, a NOTE company in Wolverhampton, where approximately 50% of production serves defence customers, NOTE UK operates across three sites with genuine depth across the air, land, cyber and marine domains.

This is not an adjacent capability. It is a dedicated, accredited, security-cleared defence electronics business – now part of a wider UK contract electronics group with the scale, breadth and shared infrastructure to serve defence customers from prototype through to long-lifecycle programme support and after-sales.

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Four Domains. One Integrated Partner.

Mission-critical defence systems require uncompromising quality. NOTE UK delivers electronics manufacturing certified to ISO 9001, IPC Class 3, ISO 27001, and AS9100 for aerospace and defence standards. These accreditations ensure reliability, compliance, and performance for secure, high-stakes applications in defence and security sectors.

Air

Advanced PCBA and box build for avionics, airborne systems and UAV electronics – manufactured to the exacting standards of weight tolerance, vibration resistance and thermal cycling that airborne defence applications demand. IPC Class 3 workmanship and AS9100-certified processes throughout.

Land

Vehicle electronics, soldier systems and ground-based platform hardware for the UK land domain – ruggedly constructed, EMI-compliant and designed for field maintainability. NOTE UK’s manufacturing processes are built to the long-lifecycle requirements of land programme support.

Cyber

Secure communications hardware, encrypted systems and network security electronics – where physical build quality, traceability, tamper-evident construction and access control are as critical as electrical performance. Manufactured in security-cleared facilities with ISO 27001-certified information security management.

Marine

Naval and maritime electronics built to withstand salt, humidity, pressure and the demanding duty cycles of seaborne operation. NOTE UK’s marine capability covers PCBA and box build for platforms where reliability in service is non-negotiable.

Frequently Asked Questions

A: We manufacture encrypted communication hardware, secure network products, thermal and surveillance cameras, motion detection systems, access control electronics, and mission-critical PCBA for UK defence and security programmes. Products are manufactured to zero-failure tolerance with rigorous environmental and EMI testing as standard.

A: Yes. NOTE UK’s defence manufacturing is delivered through STI, a NOTE company, operating from its Hook and Poynton facilities, both certified to AS9100. We serve air, land, cyber, and marine domains with IPC Class 3 PCBA and complex system integration. NOTE Wolverhampton are in the process.

A: Yes. NOTE UK’s defence manufacturing is delivered through STI, a NOTE company, operating from its Hook and Poynton facilities, both certified to AS9100. We serve air, land, cyber, and marine domains with IPC Class 3 PCBA and complex system integration. NOTE Wolverhampton are in the process.

What Our Customers Say

  • Trusted Defence Programmes

    NOTE UK delivers the programme discipline, robust security infrastructure and IPC Class 3 workmanship that defence electronics demands. AS9100-certified manufacturing across Hook and Poynton gives us confidence our most critical programmes are in safe hands.
    Programme Director,
    UK Defence Prime Contractor

  • UK Defence Supply Chain

    NOTE UK’s deep grasp of long-lifecycle defence sets them apart. From component obsolescence management through to depot-level repair support, their programme continuity capability means we can always rely on them across the full operational life of our most demanding platforms.
    Head of Engineering,
    UK Defence OEM

  • Built for Defence

    Qualifying a new EMS partner takes years. NOTE UK and STI NOTE arrived audit-ready – AS9100, List X, IPC Class 3 and ISO 27001 in place. Their UK sites have domain knowledge across air, land, cyber and marine, and a workforce that understands defence programme security from day one.
    Head of Supplier Quality,
    UK Defence Systems Integrator

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