• Public Sector
  • Hertfordshire County Council

  • Lee Valley Regional Park Authority

  • London Borough of Hounslow

  • Surrey County Council

  • Welwyn Hatfield Borough Council

  • Buckinghamshire County Council

  • Cambridge City Council

  • Chesham Town Council

  • Forestry Commission

  • The Chilterns Conservation Board

  • The City of London

  • Broxbourne Borough Council

  • Dacorum Borough Council

  • Environment Agency

  • East Herts District Council

  • Enfield Council

  • Guildford Borough Council

  • Harlow Council

  • Hertsmere Borough Council

  • Lichfield District Council

  • North Herts District Council

  • The Royal Borough of Kensington and Chelsea

  • Royal Borough of Windsor & Maidenhead

  • St Albans City & District Council

  • Stevenage Borough Council

  • Three Rivers District Council

  • Commercial Sector
  • Tarmac

  • Berkeley Group

  • RG Carter

  • Savills

  • Vinci Facilities

  • Messenger Construction

  • Interserve

  • Workman

  • R H Irving Construction Ltd

  • Taylor Woodrow

  • Mace

  • First Port

  • Taylor Wimpey

  • Martin Grant Homes

  • Knight Frank

  • Strutt & Parker

  • Bidwells

  • Groundwork

  • Fisher German

  • RSK

  • Goodman

  • Cemetery Development Services

  • Agellus Projects

  • Reliance High Tech

  • DHL

  • Globecast

  • Lightsource

  • Land & Water

  • Barhale

  • Knebworth

  • Dandara Group

  • Rapleys

  • Charity Sector
  • Woodland Trust

  • The Wildlife Trusts

  • WWT

  • Thames21

  • Cambridge Past, Present & Future

  • RSPB

  • Friends of Stockers Lake

  • Harlow Wildlife Projects

  • Newt Conservation Partnership

  • Burghley

  • Hatfield House

  • Waddesdon

  • Froglife

  • Letchworth Garden City Heritage Foundation

  • Utility Sector
  • Thames Water

  • Affinity Water

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