- Akeler Development Plc
- American Community School
- Ashburnham Community Centre
- Barr
- Bacon’s City Technology College
- Berkley Homes
- Brentford Steam Museum
- British Broadcasting Corporation (BBC)
- Building Research Establishment (BRE)
- Cannock Chase Council
- Cordwainers College
- City of London
- Dean and Chapter of Durham Cathedral
- Department for Business, Enterprise & Regulatory Reform (BERR)
- Department for Children, Schools and Families (DCSF)
- Dr Ahmed Moustafa
- Dulverton Trust
- ELWA
- Energy Technical Support Unit (ETSU)
- English Partnerships
- European Commission
- Grange Park Opera
- 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
- London Borough of Barking & Dagenham
- London Borough of Bexley
- London Borough of Hackney
- London Borough of Hammersmith and Fulham
- London Borough of Lambeth
- London Borough of Newham
- London Borough of Richmond upon Thames
- London Borough of Southwark
- London Borough of Tottenham Hale
- Lots Road Auction House
- Maidstone Borough Council
- Marston Books
- Mouchel
- Mouchel Parkman Babcock (MPB) Education
- Ministry of Energy
- North Norfolk Council
- Novera Energy Ltd
- October Gallery
- Orange Plc
- Pellikaan
- Renewable Energy Systems (RES)
- Royal Borough of Kensington and Chelsea
- Royal Borough of Kensington and Chelsea Westminster Hospital
- Royal Catholic Diocese of Westminster
- Rugby School
- Shanks Waste Services
- Southwark Leisure
- Sport England
- St Charles RC Sixth Form College
- St Mary's College
- Kingston-upon-Hull
- Townley Grammar School for Girls
- Trustees of the Henry Bowyer Trust
- Watford Borough Council
- West Lothian Council
- Waste Recycling Group (WRG)
