- Games & Hobbies, London
- Garage Doors & Door Operating Devices, London
- Garage Doors & Gates, London - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, London
- Garbage & Rubbish Removal, London
- Garment & Linen Services, London
- Gas & Other Services Combined, London
- Gas Companies, London
- Gas Engine, London
- Gas Equipment Industrial, London
- Gas Liquefied Petroleum, London
- Gas Station, London - Service & Filling Station
- Gases, London
- Gastroenterologists, London - GI Doctors, Physicians & Surgeons (Gastroenterology)
- Gazebo Builders, London - Installation, Repair & Maintenance Services
- Gemologists & Jewelers, London
- General Business Consulting, London
- General Business Services, London
- General Consultants, London
- General Freight Trucking, London - Motor Freight
- General Hardware Stores, London
- General Management Consulting Services, London - Management Consultants
- General Merchandise Stores, London
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- General Surgeons, London - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, London
- Generators, Compressors, Pumps, Motors & Fans, London
- Gift Shops, London - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, London
- Glass & Glass Products, London
- Glass & Glazing Contractors, London
- Glass - Auto, Float, Plate, Window & Doors, London
- Glass Giftware, London
- Glass Plate Windows, London
- Glass Repair, London - Car, Window, Auto Glass Repair
- Glass Tinting & Coating, London - Home - Car Window Tinting
- Go Kart Tracks, London
- Golf Cars & Carts, London
- Golf Clubs Private, London
- Gospel Church, London
- Government, London
- Graphic Design Services, London - Graphic Designer
- Graphic Designer & Artist Services, London
- Grease Traps, London
- Grocery Store Delivery Service, London
- Grocery Stores & Supermarkets, London
- Ground Transportation, Except Passenger, London
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