- Andersen Consulting
- Alfred McAlpine
- AMEC Construction
- Arthur Andersen
- Balfour Beatty Ltd.
- Ballast Wiltshier plc
- Berkley Surveying Partnership
- Bovis Lend Lease
- British Army, Sandhurst
- Birse Construction
- Bucknall Austin and Partners
- Carillion
- Clifford Chance, Solicitors
- Costain Civil Engineering Ltd.
- Crown House Technologies
- Davis, Langdon and Everest
- Edmond Shipway
- Ernst & Young
- Faithful and Gould
- Fitzpatrick Ltd.
- Fleet Air Arm (pilot)
- GallifordTry plc
- Gardiner and Theobald
- Gleeds
- HBG Construction
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- Kier Group plc
- John Laing Construction
- Laing Management
- Laing O'Rourke
- Llewellyn Construction Ltd.
- Mace
- May Gurney Construction
- Myton Construction
- Norwest Holst
- Norwich Union
- Parliamentary Works Directorate
- Price Waterhouse Coopers
- ROK
- Shepherd Construction Ltd.
- Sir Robert McAlpine
- Skanska Construction
- Stansell, Jersey Ltd.
- Tarmac Building
- Taylor Woodrow Construction Ltd.
- Tilbury Douglas Ltd.
- Try Construction
- Turner and Townsend
- Walter Lilly
- Wates Construction Ltd.
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