| Catagories | Records | | Catagories | Records |
| Abattoirs | 167 | | Alexander Technique | 239 |
| Abrasive Products - Mnfrs & Distributors | 133 | | Alloys | 59 |
| Abrasive Products - Wholesalers | 18 | | Alternative & Complementary Medicines & Therapies | 2877 |
| Access Equipment | 291 | | Aluminium Fabricators | 213 |
| Accident Management | 126 | | Aluminium Stockholders | 150 |
| Accommodation Address Agents | 42 | | Ambulance Services | 227 |
| Accountants | 12886 | | Amusement Machines | 719 |
| Accounting & Book-Keeping Services | 2323 | | Amusement Parks & Arcades | 1191 |
| Acoustic Consultants | 152 | | Angling & Sports Fishing | 462 |
| Acoustic Engineers | 93 | | Animal By-Products | 43 |
| Actuaries | 86 | | Animal Carrier Services | 58 |
| Acupuncture Practitioners | 807 | | Animal Welfare Organisations | 668 |
| Adhesive & Sealant Mnfrs & Distributors | 100 | | Anodisers | 26 |
| Adhesive Tapes | 93 | | Antique Dealers | 4526 |
| Adhesives, Glues & Sealants | 204 | | Antiques - Repairing & Restoring | 764 |
| Adoption & Fostering | 116 | | Aquarium & Pond Supplies | 801 |
| Adult Education Centres | 1105 | | Aquarium & Vivarium Tank & Accessory Mnfrs | 26 |
| Advertising - Agencies | 1728 | | Arbitrators | 39 |
| Advertising - Directories | 19 | | Archaeologists | 100 |
| Advertising - Media | 245 | | Architects | 5431 |
| Advertising - Outdoor | 215 | | Architectural Services | 1578 |
| Advertising Services | 646 | | Architectural Technologists | 258 |
| Aerial Surveys & Photographers | 61 | | Architectural Woodwork | 22 |
| Aeronautical Instrument Makers | 12 | | Armed Forces - Recruiting | 33 |
| Aerosols | 28 | | Armed Services - Reserve Forces | 401 |
| After School Care | 189 | | Aromatherapy | 677 |
| Agricultural Buildings | 65 | | Art & Craft Materials | 664 |
| Agricultural Contractors | 2117 | | Art Galleries & Fine Art Dealers | 2185 |
| Agricultural Engineers | 1095 | | Art Restoration & Picture Cleaning | 91 |
| Agricultural Machinery - Sales & Service | 981 | | Artists & Illustrators | 1134 |
| Agricultural Merchants | 1160 | | Arts | 85 |
| Agricultural Services | 692 | | Arts Centres | 433 |
| Agricultural Vehicles | 34 | | Asbestos Products & Removal | 264 |
| Air Compressors | 405 | | Asphalt & Coated Macadam Laying Contractors | 625 |
| Air Conditioning & Refrigeration Contractors | 1087 | | Asphalt & Macadam Suppliers | 77 |
| Air Conditioning Consultants | 149 | | Assessors | 264 |
| Air Conditioning Equipment & Systems | 742 | | Astrologers | 70 |
| Air Purification Equipment | 78 | | Au Pair Agencies | 99 |
| Aircraft - Services For | 556 | | Auctioneers & Valuers | 865 |
| Aircraft Charter, Renting & Leasing | 236 | | Audio-Visual Equipment & Supplies | 615 |
| Airfreight Services | 192 | | Audio-Visual Production & Presentation Services | 919 |
| Airline Services | 94 | | Auditors | 33 |
| Airline Ticket Agencies | 58 | | Auto Electricians | 824 |
| Airlines | 307 | | Autogas Suppliers & Installers | 43 |
| Airport Transfer & Transportation Services | 432 | | Automation Systems & Equipment | 278 |
| Airports | 117 | | Aviation Consultants | 173 |
| Alcohol Misuse - Advice & Counselling | 173 | | Aviation Engineers | 57 |
| | | | Aviation Supplies | 103 |
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