Local Authorities
- Dacorum Borough Council
- Aylesbury Vale District Council
- Aylesbury Town Council
- Watford Borough Council
- Weston Turville Parish Council
- Danbury Parish Council
- Stradbroke Parish Council
- Barton-Le-Clay Parish Council

Golf Clubs
- Berkhamsted Golf Club
- Knebworth Golf Club
- Dyrham Park Golf Club
- Chesham & Ley Hill Golf Club
- Boxmoor Golf Club
- Dunstable Downs Golf Club

Polo Clubs
- Royal Berkshire Polo Club
- Guards Polo Club
- Dubai Polo Club
- La Mariposa Polo Club
- Takeley Polo Club
- Burningfold Polo Club
- Binfield Heath Polo Club

Schools & Colleges
- Berkhamsted School
- Chesham Park Community College
- University of Hertfordshire
- Maltmans Green School
- Mill Hill School

Racecourses
- Wetherby
- Windsor
- Ascot
- Sandown

Cricket Clubs
- Ley Hill Cricket Club
- Hawridge & Cholesbury Cricket Club
- Portchester Cricket Club
- Hemel Hempstead Cricket Club
- Berkhamsted Cricket Club

Football Clubs
- Bisham Abbey (F.A. Training Ground)
- Sarratt Football Club
- Hertfordshire F.A.
- Berkhamsted Football Club
- Oxhey Jets Football Club
- Moulton Magpies Football Club

Rugby Union/League Clubs
- Twickenham RFC
- Marlow RUFC
- Beaconsfield RUFC
- Datchworth RUFC
- Tring RUFC
- Saracens Amateurs RUFC
- Middlesex RFU
- Ruislip RUFC
- Chesham RUFC

Sports Clubs
- Honourable Artillery Sports Club
- Birkbeck Sports Association
- Allenburys (Glaxo) Sports Club
- Vauxhall Sports Association
- London Marathon Playing Fields

Hockey Clubs
- Berkhamsted
- Burnt Ash

Baseball Clubs
- Herts Baseball Club - Falcons

Landscaping/Maintenance
Contractors
- Enterprise Plc
- Carillion
- ISS Waterers Landscapes
- Sodexo
- Oakmont Construction
- The Garden Centre Group
- Interserve