Developing a digital and sustainable world together

SII UK is a specialised provider of software, systems, manufacturing  and electronic engineering, project management, and IT services with a focus on the aerospace, defence and space domains but also covering transportation and energy. We cover the length and breadth of the UK. 

Celebrating our 10th anniversary in 2025, we're proud to be part of the global SII Group, which brings over 40 years of industry expertise to our operations.

Our Mission
At SII UK, our mission goes beyond conventional engineering services. We develop sophisticated information and mission systems that form the backbone of critical operations in aerospace, defence and space. We're passionate about contributing to the design and development of future products and services that advance our clients' capabilities and strategic objectives.
 

We combine technical expertise with deep industry knowledge to deliver solutions that address complex challenges. Our engineering approach focuses on creating robust, scalable, and secure systems that meet the exacting standards of defence and space applications.

Through collaborative partnerships with our clients, we aim to be more than just a service provider—we strive to be a trusted advisor and innovation partner. We're committed to understanding the unique requirements of each project, enabling our clients to achieve their missions while preparing them for future technological advancements.

By delivering exceptional technical solutions, we help our clients maintain their competitive edge and operational excellence in environments where precision, reliability, and security are paramount.

London
Dawson House, 
5 Jewry Street Fenchurch
London, EC3N 2EX

Chester
Unit 8, Europa Court, 
Dee View Boulevard, 
Chester, CH1 4NP

Belfast 
Concourse, 
1 Queens Rd, 
Belfast BT3 9DT

Farnborough 
Cody Technology Park, 
Farnborough GU14 0LX