| Catagories | Records | | Catagories | Records |
| M.P.S & M.E.P.'s | 530 | | Metal Finishing Equipment | 28 |
| Machine Shops | 99 | | Metal Finishing Services | 837 |
| Machine Tool Accessories & Services | 164 | | Metal Industries - Primary | 100 |
| Machine Tools - Mnfrs & Distributors | 163 | | Metal Merchants | 139 |
| Machine Tools - Sales | 317 | | Metal Products - Fabricated | 613 |
| Machinery - Industrial & Commercial | 820 | | Metal Spinners | 71 |
| Magicians Supplies & Equipment | 17 | | Metal Workers | 204 |
| Magnets | 41 | | Metals - Mining | 42 |
| Mail Order & Catalogue Shopping | 1048 | | Meter Mnfrs & Suppliers | 37 |
| Mailing Houses | 188 | | Mezzanine Flooring | 41 |
| Mailing Machines & Equipment | 59 | | Microfilming Services | 134 |
| Make-Up Artists | 48 | | Microwave Ovens | 148 |
| Manhole Cover Mnfrs & Distributors | 14 | | Midwives | 33 |
| Manufacturers | 606 | | Military Equipment Dealers | 41 |
| Manufacturers' Agents | 287 | | Mill Shops | 25 |
| Maps, Charts & Globes | 192 | | Millinery Mnfrs & Wholesalers | 28 |
| Marble Specialists | 271 | | Mills & Millers | 91 |
| Marinas | 256 | | Mineral Merchants | 83 |
| Marine Electrical & Electronic Equipment Mnfrs | 66 | | Mini Buses - Hire & Leasing | 636 |
| Marine Electrical Services | 52 | | Mini Cabs | 1359 |
| Marine Engineering Equipment Mnfrs | 23 | | Mirrors & Decorative Glass | 151 |
| Marine Engineers | 500 | | Mobile Homes | 450 |
| Marine Equipment & Supplies | 398 | | Mobile Phone Repairs | 23 |
| Marine Services | 596 | | Mobile Phones | 3557 |
| Marine Surveyors | 133 | | Mobility Equipment | 170 |
| Market Gardeners | 404 | | Model Makers | 433 |
| Market Operators | 203 | | Model Shops | 689 |
| Market Research | 803 | | Modelling Agencies | 229 |
| Market Stall Builders | 15 | | Money Transfers | 31 |
| Marketing Boards | 25 | | Moneylenders | 12 |
| Marketing Consultants | 2775 | | Monumental Masons | 804 |
| Marking & Identification Equipment | 64 | | Mortar Mnfrs | 16 |
| Marquee Mnfrs | 16 | | Mortgage Brokers | 2286 |
| Marquees, Tents & Portable Floor Hire | 537 | | Mortgages - Direct | 54 |
| Martial Arts Instruction | 415 | | Mot Testing Centres | 2505 |
| Materials Handling Equipment | 270 | | Motor Caravan Dealers | 112 |
| Maternity Wear | 68 | | Motor Cycle & Component Mnfrs | 61 |
| Mats & Matting | 29 | | Motor Cycle Breakdown & Recovery Services | 20 |
| Measuring, Analysing & Controlling Instruments | 168 | | Motor Cycle Breakers & Dismantlers | 83 |
| Meat - Wholesale | 811 | | Motor Cycle Hire & Leasing | 16 |
| Meat Product Mnfrs & Wholesalers | 182 | | Motor Cycle Parts & Accessories | 647 |
| Mechanical Engineers | 847 | | Motor Cycles & Scooters | 1901 |
| Mechanical Handling Engineers | 40 | | Motor Cycling Instruction & Testing | 339 |
| Mechanical Handling Equipment | 48 | | Motor Factors | 1914 |
| Mediation | 126 | | Motor Sports | 472 |
| Medical & Dental Laboratories | 377 | | Motoring Organisations | 65 |
| Medical Equipment Maintenance & Repairs | 76 | | Mould Mnfrs | 153 |
| Medical Equipment Mnfrs | 375 | | Multimedia & Electronic Book Publishers | 318 |
| Medical Equipment Rental & Leasing | 52 | | Museums & Art Galleries | 1372 |
| Medical Instruments - Mnfrs | 157 | | Mushroom Growers & Packers | 179 |
| Medical Waste Disposal | 19 | | Music Management & Promotion | 500 |
| Members Of Parliaments | 59 | | Music Publishers | 222 |
| Menswear - Retail | 3540 | | Music Schools | 273 |
| Menswear Hire | 115 | | Music Shops | 464 |
| Mental Health Centres | 191 | | Music Teachers | 862 |
| Merchant Banks | 15 | | Musical Instrument - Mnfrs | 162 |
| Message & Greeting Services | 13 | | Musical Instrument Repairs & Servicing | 289 |
| Metal Detectors | 39 | | Musical Instruments & Sheet Music | 844 |
| Musicians & Composers | 314 | | | |
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