- O G S Mechanics - 9-14 Millers Yard, London, Greater London, N3 2QG
- O H M Electronics Ltd - 515 Pinner Road, Harrow, Middlesex, HA2 6EH
- O H M S Electrical Services - Retreat Farm, Henley In Arden, West Midlands, B95 6DU
- O Hanlon Engineering - 46 Rarogan Road, Dungannon, Co. Tyrone, BT70 2DZ
- O Heap - Unit 10 West Side Park, Derby, Derbyshire, DE21 7AZ
- O J Electronics Ltd - Devonshire House Aviary Court, Basingstoke, Hampshire, RG24 8PE
- O K Windows - Unit 3 Mill House Twin Spires Centre, Belfast, Co. Antrim, BT13 2JF
- O L E O - Grovelands, Longford Road, Coventry, West Midlands, CV7 9NE
- O M C O UK - New Street Mills, Pudsey, West Yorkshire, LS28 8LW
- O M V Group - 62 Buckingham Gate, London, Greater London, SW1E 6AJ
- O P Chocolate - High Street, Merthyr Tydfil, Mid-Glamorgan, CF48 3TB
- O P M - 252b Gray's Inn Road, London, Greater London, WC1X 8XG
- O Plan Office - Queen Adelaide, Ely, Cambridgeshire, CB74UB
- O S A I UK Ltd - Mount House, Bond Avenue, Milton Keynes, Buckinghamshire, MK1 1SF
- O S C Telecoms Consultancy - PO Box 445, Northampton, NN4 6WE
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