Company Index
- O' Connor N M - St Ives (Cornwall)
- O'Boyle Civil Engineering Ltd - Lincoln
- O'Brien Contractors Ltd - Leamington Spa
- O'connell Construction Ltd - Newport
- O'connor Plant Hire Ltd - Cheltenham
- O'connor Sutton Cronin - Belfast
- O'connor Utilities Ltd - Manchester
- O'Donnell Developments Ltd - Birmingham
- O'Donnell Michael A - Wakefield
- O'hagan Plant - Newry
- O'Keefe Construction Greenwich Ltd - London
- O'marah Ground Work - Wimborne
- O'mullane - Runcorn
- O'mullane Civil Engineering - Runcorn
- O'Rourke Civil Engineering Ltd - Grays
- O.B.Y.Ltd - Warrington
- OA Steel Fabrication - London
- Oakbray Ltd - Stoke on Trent
- Oakdale Design Services Ltd - Newport (Gwent)
- Oakes Welding - Westgate On Sea
- Oakfield Construction - Nottingham
- Oakhurst Building and Civil Engineering Ltd - Oxted
- Oakland Garden Offices Ltd - Southwell
- Oaklands Plastics Ltd - Coleshill
- Oakleaf Conservatories Ltd - York
- Oakley Mini Diggers - Basingstoke
- Oakley Plant Ltd - Scarborough
- Oakmace Exhibitions Ltd - Waltham Abbey
- Oaksmere Refrigeration Design & Consultancy Ltd - Stowmarket
- Oakwood Construction (Derby) Ltd - Belper
- Oakwood Plant Ltd - London
- Oakworth - Kidderminster
- Oasis Plant Hire Ltd - Poole
- Oasys Technologies Ltd - Letchworth
- Ocean Corporate Hygiene - Sunbury on Thames
- OCS Engineering - London
- Octaveward Ltd - Darwen
- Ogilvie Group Ltd - Stirling
- Ogley Brothers Ltd - Sheffield
- Ohgon Electronics - Canvey Island
- Oil - Aberdeen
- Okeland Ltd - Cranleigh
- Oktopus UK Ltd - Bromsgrove
- Old Station Quarry - Somerton
- Olde Forge - Bury
- Oldfield C & R - Bristol
- Oleo International Ltd - Coventry
- Olivewood Ltd - Edgware
- Olympic Conveyor Services Ltd - St Austell
- OM Support - Northwich
- Omega Research Ltd - Ely
- Omega Technical Services Ltd - Romney Marsh
- Omega Tile Ltd - Redditch
- Omni Sensors and Transmitters Ltd - Coventry
- Omya - North Ferriby
- Omya Ltd - Matlock
- On Line Tool Hire - London
- On-Site Assessments Ltd - Washington
- One Offs Ltd - Liverpool
- Oneal Robert - Bury
- Onsite Services - Southampton
- Opal Signs Ltd - Borehamwood
- Opsol UK Ltd - Cramlington
- Opti-Cal Survey Equipment Ltd - Reading
- Optical Filters Ltd - Thame
- Optima Design Associates Ltd - Mansfield
- Optima International Ltd - Doncaster
- Optime Lighting Ltd - Hitchin
- Options Employment Ltd - Hounslow
- Orange Plant - York
- Orbital Equipment Ltd - Waltham Abbey
- Orbiter Food Machinery Ltd - Nottingham
- Orchard Hire and Sales Ltd - Cheltenham
- Orchard Plant Hire - Wellingborough
- Orford Plant Hire Ltd - Bromsgrove
- Orica Europe Ltd - Warrington
- Original Features - London
- Orion Engineering Ltd - Nantwich
- Orkney Aggregates Ltd - Orkney
- Orlight Ltd - Potters Bar
- Orpington Timber and Building Supplies Ltd - Bexley
- Osborn Steel Extrusions Ltd - Bradford
- Osborne and Collins - Walton on Thames
- Osborne Fabrications - Wigton
- Osco Ltd - Bletchley
- Oscura Ltd - Reading
- Osgood Brothers Ltd - Horsham
- Osmor Products Ltd - Hassocks
- Oso Hotwater (U.K.) Ltd - Gateshead
- Osprey Fabrications Ltd - Halesowen
- Ossett Mouldings Ltd - Dewsbury
- Oswald Record Plant Sales (Midlands) Ltd - Chesterfield
- Oswestry Industrial Buildings Ltd - Oswestry
- Otford Builders Merchants Ltd - Sevenoaks
- Otis Ltd - Burgess Hill
- Ottley Controls Ltd - Kettering
- Outlandstone co uk - Hope Valley
- OV Ford Plant Hire Services - Bridgend
- Ovenden Associates - Southport
- Overcourt Ltd - London
- Owen D Collins - Salisbury
- Owen David W - Llanelli
- Owen Mullen (Contractors) Ltd - Sittingbourne
- Owen P J & Co - Chesterfield
- Owen Pell Ltd - Hereford
- Owen Pugh and Co Ltd - Cramlington
- Owen R D & G - Shrewsbury
- Oxley Garage Doors Ltd - Hull
- Oxus Services Ltd - Woking
- Oxyburn Ltd - Halesowen
