| Computers | Cookers | Car Auctions | Car Leasing |
| Child Guidance Consultants | Churches | Commercial Vehicles | Commercial Vehicles - Accessories & Commercial Vehicles - Parts |
| Commercial Vehicles - Body Building | Commercial Vehicles - Hire | Commercial Vehicles - Parking | Commercial Vehicles - Repair |
| Commercial Vehicles - Shelving & Commercial Vehicles Storage Systems | Commercial Vehicles - Washing | Commissioners For Oaths | Commodity Brokers |
| Communications Equipment | Communications Training | Community Centres | Community Development |
| Company Formation | Company Seals - Manufacturing | Compost | Computer Aided Design (CAD) |
| Computer Based Training | Computer Cleaning | Computer Consultancy | Computer Consultants |
| Computer Equipment | Computer Equipment - Manufacturing | Computer Games | Computer Games - Wholesale |
| Computer Maintenance & Computer Repairs | Computer Networks | Computer Printers | Computer Security |
| Computer Software | Computer Stationery | Computer Supplies & Computer Accessories | Computer Training |
| Computers - Ancilliary Services | Computers - Hire | Computing Services & Bureau Services | Concert Halls |
| Concierge Services | Concrete - Precast | Concrete - Pre-Stressed | Concrete - Ready-Mixed |
| Concrete Additives | Concrete Blocks | Concrete Contractors | Concrete Cutting, Concrete Demolition & Concrete Crushing |
| Concrete Mixers | Concrete Moulds | Concrete Pipes | Concrete Products |
| Concrete Pumps | Concrete Reinforcements & Concrete Repairs | Concrete Repairs - Contractors & Concrete Repairs Suppliers | Conference Organisers & Function Organisers |
| Conference Centres | Conservationists | Conservatories & Sunrooms | Construction Advisors |
| Contact Lenses | Container Transport Services | Containers | Cabaret |
| Containers - Glass | Cabinet Makers | Containers - Plastic | Cabinet Makers - Wholesale |
| Contract Employment | Cabinet Makers' Supplies | Contractors' Equipment | Cable Detection & Pipe Detection |
| Contractors' Equipment - Hire | Cables - Electric | Control Systems - Electrical | Cables Equipment & Cables Supplies |
| Controls & Regulators | Cables - Fibre Optic | Convents | Cables Manufacturers |
| Conveyor Belts | Cables - Trunking | Conveyors & Conveyor Systems | Cables Co-Axial |
| Cables Control | Cookers - Conversion Systems | Cabs - Manufacturing | Cooperative Shops |
| Calculating Repairs & Adding Machines - Repairs | Copper | Calculating Supplies & Adding Machines Supplies | Coppersmiths |
| Calendars | Copperware | Cancer Support Groups | Calibration |
| Copyright Agents & Copyright Consultants | Car Servicing | Call Centres | Cord Braided |
| Car Stereos - Sales, Service & Installation | Calligraphy | Cork Products | Caravans, Campers & Mobile Homes - Repairing |
| Cameras | Corn Products | Cards - Identity, Security & Plastic | Camping Equipment & Camping Supplies |
| Corporate Clothing | Chauffeur & Limousine Service | Camping Equipment & Camping Supplies - Wholesale | Corporate Gifts |
| Children & Baby Wear | Camping Sites | Cosmetic Surgeries | Circuits - Printed, Stamped & Etched |
| Candles | Cosmetics - Manufacturing | Coal & Solid Fuel Merchants | Candlesticks |
| Cosmetics - Wholesale | Concrete Cutting, Demolition & Crushing | Cane & Wickerwork | Cosmetics & Toiletries |
| Cosmetic Surgery & Procedures | Canoes | Costumes - Manufacturing | Canopy |
| Counselling Services & Advisory Services | Cans & Closures | County Enterprise Boards | Car - Classic Cars & Vintage Cars |
| Couplings | Car - Gas Conversion | Courier Service | Car Services & Commercial Electrical Services |
| Craft Centres | Car Accessories - Wholesale | Craft Supplies | Car Air Conditioning |
| Cranes | Car Alarms Devices & Car Security Devices | Cranes - Hire | Car and 4x4 Accessories |
| Cranes - Manufacturing | Car Assessors & Car Valuers | Cranes - Repairing & Cranes Servicing | Crash Repairs |
| Car Dealers - New Cars & Used Cars | Creameries | Car Delivery Service | Creche Furniture & Montessori Furniture |
| Car Dismantlers | Creche Consultants | Car Distributors & Car Importers | Creches Schools & Nursery Schools |
| Car Engine Tuning | Credit Cards Services & Charge Card Services | Car Hire | Credit Check Traders |
| Credit Control | Car Painters & Car Sprayers | Credit Information Services | Car Parking & Car Garaging |
| Credit Unions | Car Parking Equipment | Crematoria | Car Parks - Marking |
| Creosote | Car Parts & Car Supplies | Crystal | Car Parts & Car Supplies - Manufacturing |
| Cultural Centres | Car Parts & Car Supplies - Wholesale | Curtain Cleaning | Car Ports |
| Curtain Fixtures & Curtain Fittings | Car Radiators | Curtains | Car Restoration |
| Curtains - Wholesale | Car Seat Covers | Customs Clearance Agents | Car Stereos - Sales & Car Stereos Service & Car Stereos Installation |
| Cutlery - Manufacturing | Car Striping Tinting & Car Window Tinting | Cutlery - Wholesale | Car Sun Roofs |
| Cycling Clubs | Car Valeting Service | Car Washing Equipment & Car Washing Supplies | Caravans - Horse Drawn |
| Caravans & Mobile Homes - Sites & Resorts | Caravans & Mobile Homes - Transport Contractors | Caravans, Campers & Mobile Homes | Caravans, Campers & Mobile Homes - Eqpt & Supplies |
| Caravans, Campers & Mobile Homes - Hire | Caravans, Campers & Mobile Homes - Manufacturing | Caravans Repairing, Campers Repairing & Mobile Homes Repairing | Carbon Paper |
| Carbon Products | Carburettors | Cardboard & Cardboard Products | Cards - Identity Cards, Security Cards & Plastic Cards |
| Cards - Memorial | Career Guidance | Carpenters & Joiners | Carpet Care & Carpet Care Protection |
| Commercial Artists | Carpets | Carpets - Cleaning | Carpets - Dyeing |
| Carpets - Layers | Carpets - Manufacturing | Carpets - Underlay | Carpets - Wholesale |
| Cartons | Cases - Industrial | Cash Wholesalers & Carry - Wholesalers | Cash Counting Machines & Sorting Machines |
| Cash Registers & Cash Suppliers | Castings - Metal | Castles, Houses & Gardens | Castors |
| Caterers | Caterers' Supplies | Catering Consultants | Catering Equipment |
| Catering Equipment - Hire | Catering Equipment - Wholesale | C.D.s, Records & Cassette Tapes | Ceiling - Cleaning & Ceiling Coating |
| Ceiling Contractors | Ceiling Materials Suppliers | Cement | Cement Machinery |
| Cemeteries | Chain Saws | Chains | Chambers Of Commerce |
| Charcoal | Charities Groups & Caring Groups | Charting Systems | Chauffeur Service |
| Cheese - Manufacturers | Cheese Importers | Chemical Consultants | Chemical Engineers |
| Chemical Plant Equipment & Chemical Plant Supplies | Chemicals | Chemicals - Manufacturing | Chemists - Analytical |
| Chemists - Consulting | Chemists - Pharmaceutical | Child Minding Services | Childcare - County Childcare Committees |
| Companies & Businesses | Childrens' & Baby Wear- Agents & Wholesalers | Childrens Wear- Manufacturing & Baby Wear- Manufacturing | Childrens Homes |
| Childrens Safety Products | Childrens' Wear | Chimney Cleaning | Chimney Cowls & Chimney Supplies |
| Chimneys | China Restoring & Ceramic Restoring | Chinaware | Chinaware - Manufacturing |
| Chinaware - Wholesale | Chiropodists | Chiropody Supplies | Chiropractors |
| Chocolate | Christian Science Practitioners | Christmas and Festive Decorations & Christmas and Festive Novelties | Christmas Trees |
| commercial video libraries | Church Furniture | Church Supplies | Cider & Perry |
| Cigarette Lighters & Cigarette Supplies | Cinema Furnishings & Theatre Furnishings | Cinema Equipment | Cinemas |
| Circuits - Printed Circuits Stamped Circuits & Etched Circuits | Citizens Information Centres | City Councils & County Councils | Civil Engineering - Consultants |
| Civil Engineering - Contractors | Cladding | Cleaning Service & Maintenance Service | Cleaning Cloths & Cleaning Rags |
| Cleaning Equipment & Cleaning Supplies | Cleanrooms - Equipment & Cleanrooms Supplies | Cleanrooms - Installation & Cleanrooms Construction | Clinics |
| Clocks | Clocks - Industrial | Clocks - Manufacturing | Clocks - Repairing |
| Chemical Waste Disposal | Closed Circuit Television | Clothes Pressing Machines | Clothing - Machinery |
| Clothing - Manufacturers' Supplies | Clothing - Manufacturing | Clothing - Used | Clothing - Wholesale |
| Clothing Alterations | Clothing Transportation | Clutches | Coach Dealers - New Coach & Used Coach |
| Coaches - Charter Services | Coal Bunkers | Coal Importers | Coal Merchants |
| Coathangers | Coding Equipment | Coffee Importers & Coffee Merchants | Coffin Makers & Casket Makers |
| Coin Dealers & Medal Dealers | Coin Operated Machines | Cold Storage | Colour Consultant & Fashion Consultant |