- O & E Electrical - Unit B6 Kingston Way, Hull, North Humberside, HU7 0XW
- O & M Electrical Services Ltd - Providence Works, Halifax, West Yorkshire, HX1 3NS
- O & M Office Equipment Ltd - 7 The Clares, Caterham, Surrey, CR3 6RW
- O & O Consultants - Disney Place House, London, Greater London, SE1 1HL
- O C M Business Systems Ltd - 2 Ascot Road, Pershore, Worcestershire, WR10 2JJ
- O C M Communications Ltd - Forward House, Henley In Arden, West Midlands, B95 5AA
- O Comitti & Son Ltd - Four Wantz Corner, Ongar, Essex, CM5 0AH
- O D B Group Ltd - Elm House, Surrey, GU8 6LB
- O D L - 1 Brooke Road, Bootle, Merseyside, L20 4XP
- O E Electrics - Thomas Maddison Lane, Wakefield, West Yorkshire, WF4 3GH
- O E S Electro Mechanical Services - 5 Northington Close, Bracknell, Berkshire, RG12 0XT
- O G D Ltd - Unit 2c Baytree Farm, Polegate, East Sussex, BN26 6QN
- O G I Groundwater Specialists - 1 St Johns Court, St Johns Road, Durham, Co. Durham, DH7 8TP
- O G L Computer Services Group - Worcester Road, Stourport On Severn, Worcestershire, DY13 9AT
- O G M - Unit 1-4 Oxford Industrial Park, Mead Road, Kidlington, Oxfordshire, OX5 1QU
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