| Airtricity | Environment Agency | RPS Group |
| AMEC | ERM | RSK Environmental |
| Arup | Halcrow | Sainsbury’s |
| Balfour Beatty | Hammersons | Savills |
| Barratt Homes | Hanson Aggregates | SevernTrent Water |
| Bidwells | Highways Agency | Skanska |
| BNP Paribas | King Sturge | Southern Scottish Electricity |
| Bovis Homes | Laing O’Rourke | Strategic Land Partnerships |
| Capita Symonds | Low Carbon Solar | Taylor Wimpey |
| Carter Jonas | National Grid | Tesco |
| Cemex | National Trust | Thames Water |
| Duchy of Cornwall | Peel Holdings | Turley Associates |
| Dulas | Pegasus Planning | URS/Scott Wilson |
| Ecotricity | Persimmon Homes | John Lewis Partnership |
| EDF Energy | Redrow Homes | Welsh Assembly Government |
| English Heritage | Renewable Energy Generation | WSP |
