- Arboricultural Association
- Biodiversity in Urban Gardens (BUGS)
- Centre for Ecology and Hydrology (CEH)
- Centre for Urban and Regional Ecology (CURE)
- Countryside Council for Wales
- Department for Environment, Food & Rural Affairs (DEFRA)
- Environment Agency
- European Academy of the Urban Environment
- Greenspace Scotland
- Groundwork
- International Institute for the Urban Environment (Delft)
- International Society for Arboriculture
- National Wildflower Centre
- Natural England
- Northern Ireland Environment Agency
- Scottish Natural Heritage
- Tree Council for Ireland
- UK UNESCO National Commission
- UNESCO
- UNESCO - MAB Urban Group
- UNESCO - Natural Sciences, People, Biodiversity and Ecology
- Urban Regeneration and the Environment (URGENT)
- World Health Organisation (WHO) Health Impact Assessment (HIA)
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