Stewart Leishman Struthers

Colas Ltd. operates as a civil engineering firm that specializes in road construction and rail trail construction. It offers traffic management, specialist processes and surface treatments, marine construction, and mechanical services. The firm also offers overbanding, anti skid, sealants, and waterproofing. The company was founded in 1922 and is headquartered in Warley, the United Kingdom.

Allied Infrastructure Management Ltd. offer a range of specialist approved products for concrete and asphalt infrastructure maintenance. It offers solutions for concrete infrastructure, asphalt infrastructure, diamond drilling, ironwork reinstatements, and cracks and falling joints. The company was founded in 1995 and is headquartered in Leigh, the United Kingdom.