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D/Gauge are specialists in gauging and clearance assessment. They are a team of expert gauging consultants who unlock insights from data and apply generations of experience, no matter the size or complexity. In addition, D/Gauge have bespoke software which has been created from decades of research and data science and uses algorithms that are able to tackle any gauging challenge.

DP Building Systems was established are a specialist distributor of cable management, fixing and fasteners solutions. DP Building Systems was established in 1998 as a value-added specialist distributor of cable management, fixing and fasteners solutions with distribution centres in Birmingham and Kent. We support customers with a number of value-added services which include, take off services, DfMA services and Channel cutting services.

dormakaba UK & Ireland is a member of the dormakaba group. We can now offer you an expanded, comprehensive portfolio of services within security and access for rooms and buildings.

Dakota is a provider of Voice-Directed Maintenance & Inspection (M&I) solutions.

For organisations and professionals developing external environments, we make light work.

Diamond is a dynamic and growing business. As we continue to develop a broad portfolio of service offerings, our vision is to become the go-to industry partner for innovative and collaborative working relationships, delivering high quality and value-added services throughout the rail sector.

Depot Rail Limited was started in 2001 as a rail based consultancy company, but quickly became involved in the specification and sourcing of equipment for rail maintenance depots.

D2 Rail offers bespoke Programme Management Solutions for mainline and mass transit rail.