- Classifications
- Cabinet Makers
- Cable TV Services
- Cabling and Wiring
- Cafes and Tea Rooms
- Cake Decorating Services
- Car Accessories and Parts
- Car and Commercial Repairs
- Car Body Repairs
- Car Dealing
- Car Engine Tuning
- Car Leasing and Contract Hire
- Car Manufacturing
- Car Rental
- Car Security
- Carbide Knives
- Care Centres
- Care Providers
- Carpenters and Joiners
- Carpet and Upholstery Cleaning
- Carpets and Rugs
- Case Manufacturers
- Cash Registers
- Cashflow Projections
- Catering Equipment
- Catering Food and Drinks
- CCTV and Video Equipment
- Ceiling Contractors
- Cellar Coolers
- Central Heating Installation
- Certification Bodies
- Chains
- Charities and Voluntary Organisations
- Chartered Certified Accountants
- Chemical Recycling
- Cheque Cashing
- Childcare Services
- Children and Babywear
- Chillers
- China and Glassware
- Chiropodists and Podiatrists
- Cinemas
- Cladding and Installation
- Classic Car Specialists
- Clocks and Watches
- Clubs and Associations
- Coach Hire
- Coffee Machines
- Coffee Shops
- Colour Suppliers
- Commercial Cleaning Services
- Commercial Refrigeration Equipment
- Commodity Brokering
- Communication Systems
- Community Centres
- Competition Engines
- Computer Consultants
- Computer Consumables
- Computer Maintenance
- Computer Networking
- Computer Services
- Computer Systems and Software Development
- Computer Training
- Concert Organisers
- Concrete and Mortar
- Conference Rooms and Centres
- Construction and Building Materials
- Consulting Engineers
- Corporate Entertainment
- Corporate Finance and Law
- Corrosion Prevention
- Cosmetic Surgery
- Counselling Services
- Courier Services
- Crane Maintenance and Repair
- Crane Manufacturing
- Credit and Finance Companies
- Customs and Excise
- Cycles and Tricycles
