• National Grid
• Alfred McAlpine
• Norwest Holst
• Land & Marine
• Costain
• Hollerans
• Amec
• British Gas International
• Dutco McConnell Dowell
• CCIC
• CRC-Evans Pipeline International Inc.
• John Brown Engineers & Constructors Ltd.
• Costain/Spie-Capag Joint Venture
• PEC/Preussag Joint Venture
• Preussag GmBH
• Afrox Finance Limited
• Scottish Hydro-Electric plc.
• SkodaExport Company Limited
• Smithkline Beecham
• Entrepose-Laing Joint Venture
• Amec Spie-Capag SA/Pt. Citra-Indonesia
• Brown & Root
• Murphy L.L.C.
• Wales & West Utilities
• Scotia Gas
• Severn Power
• United Utilities
• Jacobs Engineering
• WM Hare
• AB Mazeikiu Nafta