A New Era of Engineering Excellence

Diamond Business Park (formerly Ecclesfield Business Park) has undergone an impressive transformation over the past few years. Alongside major site investments, four of its leading companies have rebranded and united under one new name – the Diamond Group.

As of January 2026, Daedalus Design Services, CTL Seal, TFL Responsive Engineering, and Diamond Rail Services have come together to form the first four divisions of the group: Diamond Design, Diamond Engineering, Diamond Responsive Engineering, and Diamond Rail.

The rebranding process, which began in 2025, was a major undertaking involving teams from all four companies. Every element was designed to create a cohesive, forward-looking identity that embodies the group’s core values and collective strength. Together, the divisions now stand behind a single, unifying vision and promise:

Engineering the Diamond Standard

“With rebranding all of our engineering companies, valued customers and future partners can clearly see the full range of abilities we offer within our engineering environment. We also hope further strategic suppliers will join the group, increasing the support, capability and value we provide across the wider engineering community for projects, partnerships, innovation, growth, quality, reliability, expertise, performance and collaboration” – Andrew England, Owner and Managing Director

This rebrand brings clarity to the long-standing relationship between the companies and reflects a shared commitment to quality, innovation, and progress. Having already worked closely on numerous large-scale projects, the divisions can now offer a true turnkey service for our customers – from initial design and manufacture through to installation and on-site support – all under one roof and one trusted name.

The group is future-focussed, with hopes that improved collaboration and internal best-practice meetings will not only help us to improve the service we offer, but also create a culture of continuous improvement, allowing us to drive toward our goal of industry leadership and complete customer trust.