- ADEC
- Akeler Developments
- American Community School
- ARK
- Ashburnham Community Centre
- Barr Construction
- Bacon’s City Technology College
- Balfour Beatty
- BARR Berkley Homes
- Biossence
- Bowmer and Kirkland
- Brentford Steam Museum
- British Broadcasting Corporation
- Building Research Establishment
- Cabe
- Cannock Chase Council
- Capita
- Catholic Diocese of Westminster
- Chelsea and Westminster Hospital
- City of London
- Colonnade
- Cordwainers College Dean and Chapter of Durham Cathedral
- Department for Business, Enterprise & Regulatory Reform
- Department for Children, Schools and Families
- Department of Energy
- Dr. Ahmed Moustafa
- Donabauer, Peter and Lorraine
- Dulverton Trust Energy Technical Support Unit
- English Partnerships
- European Commission
- GEMS
- Grange Park Opera
- Galliford Try
- Haileybury and Imperial Service College
- Hammersmith Community Garden Association
- Highways Authority International Energy Agency
- Inverclyde Council
- KPMG
- Lansdown Estates Group
- Larmenier RC Infant’s School
- Larmenier and Sacred Heart School
- Lincolnshire County Council
- London Borough of Barking & Dagenham
- London Borough of Bexley
- London Borough of Brent
- London Borough of Hackney
- London Borough of Hammersmith and Fulham
- London Borough of Haringey
- London Borough of Lambeth
- London Borough of Newham
- London Borough of Richmond upon Thames
- London Borough of Southwark
- Lots Road Auction House
- Maidstone Borough Council
- Marston Books
- Mercia Waste Management
- Merseyside Waste Development Authority
- Mouchel
- Mouchel Babcock Education
- North Norfolk Council
- Novera Energy
- October Gallery
- Orange
- Pellikaan
- Rackham Construction
- Renewable Energy Systems
- Royal Alexandra and Albert School
- Royal Borough of Kensington and Chelsea
- Rugby School
- Sir Robert McAlpine
- SG Litchfield
- Shanks Waste Services
- Southwark Leisure
- Sport England
- St Charles Catholic Sixth Form College
- St Mary’s College Kingston-upon-Hull
- Tilbury Green Power
- The Learning Trust
- The Skinners Company
- Townley Grammar School for Girls
- Trustees of the Henry Bowyer Trust
- Watford Borough Council
- West Lothian Council
- Waste Recycling Group
- Willmott Dixon Construction
