- Classifications
- Nail Technicians
- Nameplates
- Nanny Agencies
- Nano Particle Design Technology
- National Associations
- Natural and Precast Stone Merchants
- Naval Architects and Surveyors
- Netting
- Network and Data Communications
- News and Photo Agencies
- Newsagents
- Newspaper and Magazine Publishers
- Night Clubs
- Noise Control
- Non Ferrous Metals
- Notaries Public
- Number Plates
- Nurseries and Creches
- Nurseries Wholesale
- Nursery Schools
- Nurserymen Trees and Shrubs
- Nursing Agencies
- Nursing Homes
- Nuts Bolts and Fixings
