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Havant Borough
- Friends of Hollybank Woods
- Friends of Nore Barn Woods
- Friends of Park Wood
- Havant Borough Council
Hampshire
- Hampshire Conservation Volunteers
- Portsmouth and Southsea Tree Wardens
Hampshire County Council
East Hampshire Tree Wardens
National
- Ancient Tree Hunt
- British Trees
- Green Space
- Hedgerow Harvest
- Natural History Museum – Urban Tree Survey
- The Tree Council
- Tree Council Twitter
- Trees For Cities
- Wood Watch
- Woodland Trust – Trees For All
