| Catagories | Records | | Catagories | Records |
| Dairies | 1479 | | Distilleries | 138 |
| Dairy Equipment Suppliers | 102 | | Distribution Services | 1952 |
| Dairy Farmers | 4267 | | Divers | 101 |
| Dairy Produce Merchants | 230 | | Divers Equipment & Supplies | 181 |
| Damp & Dry Rot Control | 1054 | | Diving Schools | 142 |
| Damp Course Mnfrs | 3 | | Do It Yourself Shops | 2284 |
| Dance & Balletwear | 357 | | Do It Yourself Wholesalers | 45 |
| Dancing Schools | 1399 | | Doctors | 34813 |
| Database Services | 113 | | Document Image Processing Systems | 145 |
| Dating & Friendship Agencies | 124 | | Dog Breeders | 127 |
| Day Centres | 2369 | | Dog Clipping & Grooming | 1294 |
| Debt Advice Centre | 9 | | Dog Training | 245 |
| Debt Collection Agencies | 384 | | Dolls & Dolls' Houses | 271 |
| Decking | 59 | | Dolls' Hospitals | 24 |
| Decorators' Merchants | 566 | | Domestic Appliances - Sales | 898 |
| Dehumidifiers & Humidifiers | 11 | | Domestic Appliances - Servicing, Repairs & Parts | 1761 |
| Delicatessens | 1698 | | Domestic Staff | 23 |
| Delivery Services | 2710 | | Door & Gate Operating Equipment | 86 |
| Demolition & Dismantling Contractors | 548 | | Door & Window Furniture | 58 |
| Dental Equipment & Supplies | 272 | | Door Manufacturers - Domestic | 162 |
| Dental Technicians | 1402 | | Door Manufacturers - Industrial | 266 |
| Dentists | 15497 | | Doors & Shutters - Sales & Installation | 324 |
| Department Stores | 2737 | | Doors - Repairing | 91 |
| Design Consultants | 2239 | | Double Glazing Installers | 4416 |
| Design Engineers | 395 | | Double Glazing Repairs | 50 |
| Designers - Furniture | 139 | | Double Glazing Suppliers | 888 |
| Designers - Garments | 503 | | Drain & Sewer Clearance | 871 |
| Designers - Graphic | 4502 | | Drain & Sewer Clearance - Equipment | 17 |
| Designers - Jewellery | 93 | | Drainage Contractors | 330 |
| Desk Top Publishing Equipment & Services | 176 | | Drama Schools | 262 |
| Detective Agencies | 705 | | Draughtproofing Installers | 12 |
| Developers - Land | 128 | | Draughtsmen & Drawing Services | 431 |
| Development Agencies | 133 | | Drawing Office Equipment & Materials | 80 |
| Diamond Cutters, Polishers & Merchants | 59 | | Dress Agencies | 541 |
| Diamond Tool Mnfrs | 68 | | Dressmakers | 525 |
| Diamonds Industrial - Services | 19 | | Dresswear Hire | 343 |
| Dictation Machines & Systems | 32 | | Drilling & Boring Equipment & Supplies | 96 |
| Die-Casting Equipment & Services | 73 | | Drilling Contractors | 252 |
| Diesel Engine Equipment & Services | 75 | | Drinks - Delivered | 8 |
| Diesel Fuel Injection Services | 98 | | Driver Hire Agencies | 111 |
| Dieticians & Nutritionists | 158 | | Driving Schools | 7635 |
| Direct Mail | 437 | | Drug Misuse - Advice & Counselling | 257 |
| Directories | 30 | | Drug Stores | 963 |
| Directory Publishers | 87 | | Drums, Kegs, Barrels & Casks | 72 |
| Disability & Special Needs - Services | 925 | | Dry Cleaners | 4404 |
| Disability Equipment - Mnfrs & Suppliers | 850 | | Drystone Walling | 26 |
| Disco Equipment | 227 | | Ducting & Duct Fittings | 268 |
| Discos | 108 | | Dust Extraction Plant & Equipment Mnfrs | 23 |
| Discos - Mobile | 1747 | | Dust Extraction Systems | 72 |
| Discount Centres | 1606 | | Dvd Suppliers | 15 |
| Dishwashing Machines - Sales & Service | 16 | | Dyers | 130 |
| Display & Window Dressing Services | 64 | | Dyslexia Information & Support | 112 |
| Display Fixtures & Materials | 317 | | Disposable Products | 130 |
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