| O C S Group Ltd - Other building completion |
| Oak Tree Dental Practice - Dental practice activities |
| Oakwood Computing Ltd - Adult and other education not elsewhere classified |
| Occasionally Yours - Other retail sale in specialised stores |
| Oddbins Ltd - Retail sale of alcoholic and other beverages |
| Old Mid-Whitgiftian Association - Operation of sports arenas and stadiums |
| Old Whitgiftian Association - Operation of sports arenas and stadiums |
| On Four Wheels - Sale of motor vehicles |
| Orchard Editorial - Other business activities not elsewhere classified |
| Orchard Flooring & Carpet Co - Floor and wall covering |
| Orpington Car Stereos - Sale of motor vehicle parts and accessories |
| Ozzies Charcoal - Restaurant |
| Options - Placement Agencies |
| Occasionally Yours - Retail And Wholesale Florists And Nurserymen |
| Orchard Editorial - Editorial Services |
| On Four Wheels - New And Used Car Dealers |
| Occitan Ltd - Publisher |
| Oakwood Building Contractors Ltd - Residential Building Construction Contractors |
| Ozzies Charcoal - Take-Away Food Retailers |