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Organisations signed up for the 2022 Challenge 

Redrow
Atkins and Tarmac
ISG
RG Group
Murphy Group
Network Rail
Severn Trent 
BAM, Environment Agency
Cornwall Council, Cormac, EA, Cornwall Wildlife Trust
Brighton and Hove City Council
Jacobs, Anglian Water
Kier, Treeconomics, National Highways
Alyth, Perth & Kinross
Kier Infrastructure, Environment Agency
HS2, Laing Murphy JV/Three Shires Ltd
Cormac Solutions Ltd and Cornwall Council
HR Wallingford
Mott MacDonald and Conwy County Borough Council
Peter Donegan Garden Design for Motive Television (on behalf of property owner)
Peter Donegan Garden Design, for Hervé Francois, Historial de la Grande Guerre
Mott MacDonald Bentley on behalf of Yorkshire Water Services and Leeds City Council
Vistry Partnerships 
Cadent Gas, United Living Energy Services and High Speed 2
East West Rail Alliance on behalf of Network Rail
Vertical Meadow
Grosvenor, Blenheim House Construction, Vertical Meadow
Kier, Environment Agency, Clinton Devon Estates 
Sir Robert McAlpine (SRM) and Battersea Power Station Development Company (BPSDC)   
Barratt Developments
Barratt Developments and RSPB
Barratt David Wilson Homes
Yorkshire Water, Stantec, Barhale Doosan JV
Thakeham