Category M
- Machine Tool and Part Manufacturing
- Machine Tools Wholesaling
- Machinery and Equipment Wholesaling
- Made Up Textile Product Manufacturing
- Magazine Publishing
- Magnetic Tape Manufacturing
- Magnetic Tapes Manufacturing
- Magnetic Therapy Service
- Make up Artists
- Malt Extract Manufacturing
- Malt Manufacturing
- Management Consultancy Service
- Management Training Service
- Manchester Retail
- Manicure Service
- Maps Publishing
- Marble Quarrying
- Margarine Manufacturing
- Marina
- Marine Accessories Retailing
- Marine Engineering Service
- Marine Fishing
- Marine Insurance
- Marine Oils Wholesaling
- Market Research Service
- Marketing Services And Consultants
- Markets
- Marriage Guidance Service
- Martial Arts and Self Defence
- Massage Equipment and Supplies
- Massage Therapy
- Match Manufacturing
- Materials Handling
- Maternal Fetal Medicine
- Maternity Hospital
- Maternity Wear Retail
- Mattress Manufacturing
- Meals On Wheels Service
- Measuring Instruments Manufacturing
- Meat Manufacturing
- Meat Packing
- Meat Processing
- Meat Product Manufacturing
- Meat Wholesaling
- Medical And Pathology Services
- Medical and Surgical Equipment Manufacturing
- Medical Clinic
- Medical Equipment Sterilization
- Medical Oncologist
- Medical or Scientific Equipment Wholesaling
- Medical Research
- Medical Research Institution
- Medical Specialists
- Medicine Manufacturing
- Meditation
- Menswear Manufacturing
- Menswear Retail
- Metal and Mineral Wholesaling
- Metal Coating and Finishing
- Metal Doors and Gates Manufacturing
- Metal Nuts Screws or Bolts Manufacturing
- Metal Ore Mining
- Metal Plating and Coating
- Metal Polishing or Finishing
- Metal Recycling
- Metal Scrap Wholesaling
- Metal Shutters and Screens Manufacturing
- Metal Windows Manufacturing
- Metallic Ores Wholesaling
- Metallurgical Services
- Metalworking Machinery Manufacturing
- Metalworking Machinery Wholesaling
- Meteorological Services
- Microbiologist
- Microchip Manufacturing
- Microfiche Production Services
- Microphones Manufacturing
- Midwifery Services
- Migration Consultants and Services
- Milk Baby Food Manufacturing
- Milk Bars and Convenience Stores
- Milk Powder Manufacturing
- Milk Processing
- Milk Processing Equipment Wholesaling
- Milk Receival or Distribution Depot
- Millinery
- Millinery Wholesaling
- Mineral Exploration Services
- Mineral Sand Mining
- Mineral Water Manufacturing
- Minerals Wholesaling
- Mining and Construction Machinery Manufacturing
- Mining Contractors
- Mining Engineering Service
- Mining Equipment Wholesaling
- Mining Exploration
- Mining Machinery Manufacturing
- Mining Services
- Mirrors Manufacturing
- Mobile Home Dealer
- Mobile Phone Battery Wholesaling
- Model Agency
- Modelling School
- Money Market Dealers
- Monorail Operation
- Monuments Making
- Mortgage Broker
- Mosques
- Motel
- Motion Picture Exhibition
- Motor Accessory Shops
- Motor Body Trimming
- Motor Cycle Dealer
- Motor Vehicle Accessories Distribution or Wholesaling
- Motor Vehicle Accessories Manufacturing
- Motor Vehicle and Parts Manufacturing
- Motor Vehicle Auctioning Service
- Motor Vehicle Batteries
- Motor Vehicle Battery Wholesaling
- Motor Vehicle Body Manufacturing
- Motor Vehicle Conversion
- Motor Vehicle Dismantling and Used Part Dealing
- Motor Vehicle Electrical Parts and Instruments Manufacturing
- Motor Vehicle Engine Manufacturing
- Motor Vehicle Hiring
- Motor Vehicle Inspection Service
- Motor Vehicle Insurance
- Motor Vehicle Manufacturing
- Motor Vehicle New Part Dealing
- Motor Vehicle Paint Wholesaling
- Motor Vehicle Parts Distribution or Wholesaling
- Motor Vehicle Parts Manufacturing
- Motor Vehicle Radiator Repairing
- Motor Vehicle Servicing And Mechanic
- Motor Vehicle Transmission or Gearbox Services
- Motor Vehicle Wheels and Tyres Retailing
- Motor Vehicles Distribution and Wholesaling
- Motor Wreckers
- Motorcycle And Scooter Retail
- Motorcycle or Scooter Parts and Repairs
- Motorcycles Manufacturing
- Mufflers and Exhaust Systems
- Mufflers Manufacturing
- Musculoskeletal Medicine
- Museum
- Mushroom Growing
- Music and Theatre Productions
- Music Composer
- Music Group Management Service
- Music Retail
- Music School and Teaching
- Music Therapist
- Musical Bands
- Musical Instrument Manufacturing
- Musical Instrument Repairs And Parts
- Musical Instruments
- Musicians
- Myotherapist
