| oa building | SE14 6RL |
| Oak Leaf Joinery | L23 1UE |
| Oakdale Windows Ltd | HX1 5SP |
| oakfields | SG3 6DF |
| OAKLAND CONSTRUCTION LTD | BS15 3DN |
| oaklands catering services | HD5 |
| Oaklea Products | TF8 7LG |
| Oakley Architects Ltd | B75 5QL |
| Oakley Interiors | GU99JB |
| Oakley Interiors Ltd | GU9 9JB |
| Oakminster Limited | DL1 3EW |
| Oaktree Architectural | Y0322YL |
| Oaktree Interiors Ltd | RG415EX |
| oakwell construction | NN6 6AF |
| oakwood architectural design | L31 9BH |
| oakwood plant ltd | SG6 3QJ |
| Oasis Academy Hadley | EN3 5PA |
| Oasis Construction London Ltd | GU14 6BS |
| Oasis Urban Design and Architecture | S21 4DN |
| oASIS wINDOWS & dOORS lTD | BN27 2BY |
| OB Architecture Ltd | SO23 9ES |
| Obbard Limited | SW10 0XA |
| OBE Company | 7390 |
| obenauf | 10437 |
| OBERLANDERS ARCHITECTS LLP | EH3 7NS |
| Oberon Plumbing | LL55 4YW |
| Obimat Global Resources Ltd | 3Q37 |
| object Architecture Ltd | SW17 8SN |
| Object Space Place | SE1 3ER |
| Objectives | W4 4NF |
| Obor Construction | L267ZJ |
| oboyle | LN1 2NX |
| OBRASCON HUARTE LAIN SA | 8320113 |
| Obsess Wall CO., LTD | 518000 |
| OC Architects LLP | SN1 5LE |
| OCCOA Construct Ltd | 23401 |
| Occupational Therapy Service | CT5 3SS |
| Ocean Media Group | M21 9LT |
| Ocean Power Corporation | 518040 |
| oceaneering multiflex | KY112XS |
| OCEANS ELEVEN CASINO | 92054 |
| ocl ltd | SS15 6TD |
| OCO LTD | BR1 4JW |
| OCSI-CI | 00000 |
| October Gallery | WC1N 3AL |
| OCTOPUS TECHNOLOGIES & SERVICES LTD | 234 1 |
| Oculus Architects | NW1 0AB |
| OD FOrmwork | HA9 0YJ |
| ODA | 10012 |
| ODC Door & Glass Systems | W3 8BN |
| ODDJOB (Solutions) | NR30 2AR |
| Odeum Architecture | BT40 9BQ |
| ODOS architects | EC1N 8DX |
| OEITC interiors | 120315 |
| OF&G | SY4 3AG |
| ofer proj. | P.B. 102 |
| Off the rails | NP47SS |
| Office for political Innovation | 28028 |
| Office Incorporated Architects | LU7 0BH |
| Office of Public Works | - |
| OFFICE PROJECTS LTD | SW15 2 JJ |
| Office Sian Architecture & Design | E17 6SL |
| Office Supplies | 112 |
| Officetwentyfive Architecture LLP | SE1 1GN |
| Offset Architects Ltd | TN15 7RS |
| oftech | 234 |
| OGC Maintenance Ltd | CT3 4JJ |
| oger | NONE |
| Oger Abu Dhabi LLC | 00000 |
| ogilvie construction | FK7 8ES |
| Ogilvy MacRae Architects | E5 8EB |
| Ogims Global Concept Ltd. | 800004 |
| OHMG | BT65HEE |
| Oil & GAs development Co LTD ( OGDCL Pakistan ) | 44000 |
| OIL MARK | 91939 |
| oil refineries ltd | 31000 |
| Oil Tech International | 108513 |
| Oil The Wheels | TW183BA |
| OILFIELDS SUPPLY CENTRE | 112 |
| Oilmark international | 91939 |
| oj property services | BA160RW |
| OJ&T CONSULTING | 234 |
| OK Certification | IM6 1AU |
| okaytech security company Limited | 234 |
| oktra | EC1N 8UB |
| OLALIZ INTERNATIONAL LIMITED | 55436 |
| Old Town Developments | SN6 7AQ |
| Old Vicarage Interiors | S45 0AB |
| Oldcastle Glass Perrysburg | 43551 |
| Olde Forgew Holding Ltd | CH62 6AR |
| Oldham College | OL9 6AA |
| oldmeadow plastering | RH6 7JD |
| oldworker abrasives | 255000 |
| olicanian cricket club | LS29 0ST |
| Olive Modular ltd | SO14 3JZ |
| Oliver Burston Architects | N2 9DU |
| Oliver Leech Architects | SW18 4UQ |
| Oliver Morgan Architects | SW10 0QJ |
| Oliver West & John Scott Architects | W4 1LL |
| oliver's battery primary school | SO224HP |
| Ollier Smurthwaite Architects | M2 6BA |
| OLMEK LIMITED | W3 8SE |
| OLT Designs | EX16 4HJ |
| OMANSHAPOORJI COMPANY LLC | 1347 |
| Ombersley Bakery | WR9 0DP |
| Ombersley properties | WR9 0DQ |
| Omega Enviromental Tech | KT2 7JD |
| OMEGA SERVE LTD. | 2371 |
| Omega Steel Building Solutions Ltd | B62 8NQ |
| OMF DEREK COX ARCHITECTS | L1 2SX |
| OMF Derek Cox Architects | L1 7BG |
| OMI Architects | M3 7AQ |
| OMMX Studio | WC1N 2NP |
| Omni Architects | BT20 5AW |
| Omnide | NW3 5BE |
| omnikon ltd | DY8 1BY |
| OmniVision Technologies | 1215 |
| OMRANIA & ASSOCIATES | 11461 |
| Omrania Associates | 21314 |
| On Architecture | CT1 2RP |
| on behalf Ascot Baptist Church | SL5 8LF |
| On Par Gold Driving Range Ltd | CB6 2SH |
| ONA CHEMICAL CO ,LTD | 050000 |
| ONCOM LIMITED | B97 6SU |
| One 17 AD Chartered Architects | HD4 7PD |
| One creative environments | WR5 2QX |
| One Creative Environments Ltd | WR5 2QX |
| One Nucleus Ltd | CB21 6GS |
| One-Off Designs | SY23 2DX |
| One-World Design, | GU1 4XA |
| OneSite | NR33 7NA |
| Onestop Precision Engineering LTD | SL0 9NG |
| Onion Flats | 19122 |
| online desgn | A |
| Online Plumbing | WD50ST |
| Onsite Central Ltd | S80 3AT |
| ONYX INTEGRATED SERVICES LIMITED | 500102 |
| opa ltd | CR8 2JG |
| opal driveways | SA12 8PN |
| Open Architecture Kent Ltd | TN13 1EB |
| Open London | EC4V 3DB |
| Open Practice Architecture | E2 6QF |
| OPEN SPACE property maintenance | NE97DH |
| Opencrete Inc. | 07901 |
| Openeight Ltd | WC2N 5NT |
| Openstudio Architects | W1W 7ND |
| Opera Solutions | WC2E 9SB |
| Opex International Trdg Co.LLC | 181796 |
| opm group | LS126TG |
| Opos Mobile International Inc | L4C 5H1 |
| Optar Technologies | GL10 2NA |
| Optima Construction | 85251 |
| optima construction | NE8 1PQ |
| Optima Interiors Ltd | WN2 4HX |
| Optimum Construction Ltd | RG41 4DN |
| Opulence Executive Travel | BD1 3RG |
| Opus ACC | N3 3HR |
| Opus Building Solutions Ltd | SG12 4BF |
| opus international | PO16 0QS |
| OPUS International (UK) Ltd | BS32 4QW |
| Opus International Consultants (UK) Ltd | CF3 0FB |
| Opus waterproofing solutions ltd | TN15 8RQ |
| OPW | D02 Y098 |
| OPW | T12 W027 |
| Oracle Managed Services | DA2 6QG |
| Orange and Black Ltd. | UB6 7JZ |
| ORASCOM | 11221 |
| Orascom trading | 32213 |
| orascom-contrack | 11211 |
| orbit architects | E9 6AY |
| Orbit Architects | SE18HA |
| Orbit Design & Build Co |Ltd | BA4 6AH |
| Orbit First Step | CV3 2SU |
| Orchard Construction | TN185HY |
| Orchard Build Ltd | WC1X 8HR |
| Orchard Contracts | TN3 9JB |
| Orchard lighting Ltd | SY4 3DY |
| Orchard Street LLP | CM1 1SS |
| Orchestrate | SW116RX |
| Orchil Architectural Consultants | PH16 5LR |
| OrdA | T3E 7K1 |
| Order Line Limited | LE11 3HA |
| Orefelt Associates Ltd | NW10 3NX |
| Oregon Timber Frame Ltd | TD7 5EB |
| Oriel Architecture | DT9 4HP |
| oriel services ltd | PO15 7AF |
| Orient Lead Gruop Limited | 330 |
| Orientor Ltd | NW3 3AY |
| Origami Frog Ltd | TN9 9LQ |
| Origin 3 Studio | BS8 1PD |
| Origin Architecture Studio, | JE2 3LU |
| Origin Housing | NW11BS |
| origin leisure group | UB9 6TG |
| Origin Retail Property Services | PL1 1EA |
| Original Construction Co Ltd | BS31 3ET |
| Orion Controls and Technologies FZC | |
| Orion Engineering | IV2 6AA |
| Orion Security Solutions Limited | OX5 1LQ |
| ORION TRENT | HA4 0AF |
| ORION TRENT | HA40AF |
| Orkney Islands Council | KW15 1NY |
| orleton ltd | SL5 9JY |
| ormandy | HX1 4DB |
| Ormandy Rycroft | BD8 9TB |
| Orme Ltd | BA16 8RH |
| Orme property solutions ltd | DE757EF |
| Ormerod Sutton Architects , | LS12 2DS |
| Ormiston & Co | SE19 2NT |
| ormond const | NW2 |
| Orms | EC1Y 1HQ |
| Ormskirk Civic Hall | L39 1LN |
| orona | BD21 4PF |
| Orona MidWestern | LIMERICK |
| ORTO | 443022 |
| Orton Construction Ltd | B25 8RE |
| OS SERVICES & TRADING | 56100 |
| OSANIQS QUANTITY SURVEYORS | NIGERIA |
| osborne | NW11 7BN |
| Osborne | RH2 0LE |
| Osbornes Architects | WR8 0DN |
| Oscar & Oscar | BT14 6NF |
| Oscar Mayer ltd trading as Rowan Foods | LL139UG |
| Oscar Michel, Arq. | 44637 |
| OSEL Architecture | W1U 5PR |
| OSG architecture Ltd | TN25 5EN |
| Oskomera Facades | SE83EY |
| OSP Architecture, | GU9 8QT |
| Ostick and Williams | BT3 9JQ |
| OTC | 54660 |
| OTEAC LTD | AB12 5GB |
| OTEIS | 75017 |
| othaim | 11437 |
| Otherplace Productions | BN2 1TE |
| Otiima UK | EC2A4NE |
| Otter Homes Ltd | TA20 3QL |
| Ouchen mechanic &electronic co,ltd | 315000 |
| Oulart The Ballagh Gaa | N/A |
| OULON | 315800 |
| Our Cow Molly Dairy Ltd | S6 6GW |
| OURRIS PROPERTIES LTD | N14 4QB |
| Ouseburn Self Storage Ltd | NE7 7BU |
| Out & About (Independent Living) Ltd | GU34 2AB |
| Outdoor GreatRooms Company | 55337 |
| Outotec (Canada) Ltd. | L7L6M3 |
| Outpost | SE1 7LG |
| Outstanding Branding | SE1 1QL |
| oventrop | RG24 7NG |
| Overall property maintenance | LS8 2BS |
| Overbury | ` |
| Overbury | RG12 7BW |
| Overbury Plc | RG12 7BW |
| Overbury plc | W1T 3EW |
| Overend Architects | CA13 9YP |
| Overhall Contractors Limited | DN15 9AE |
| Overrail Services Limited | SS4 1JU |
| Overton Architects | LS29 8AL |
| Ovolo Designs | EN1 2PP |
| Owen Architects Ltd | EC1M 5UJ |
| Owen Bond Partnership, | NR3 1AB |
| owen ellis architects | L1 5AS |
| owen Fabrication | UB6 7PH |
| Owen Hicks Architecture | HR4 9DG |
| Owen Owen Renovations Ltd | B75 5UB |
| owen pugh GDC Ltd | NE21 5TX |
| owens galliver architects | RG8 7AB |
| Owens Galliver Architects LLP | RG8 7AB |
| owl and pussycat centre | AB424RJ |
| OWL Architects | NR35 1ET |
| own | 19858 |
| Oxfam GB | CV32 5JS |
| oxford and cherwell valley college | OX11SA |
| Oxford Architects | OX1 5BS |
| Oxford Architects LLP | BS10 5EN |
| Oxford Architects LLP | OX1 5BS |
| Oxford Composites Ltd | OX29 4TH |
| Oxford International College | OX4 1BD |
| Oxford Joinery Ltd | OX5 1JE |
| Oxford Kitchens | OX13 6DN |
| Oxford Spires Four Pillars Hotel | OX1 4PS |
| Oxshott Medical Practice | KT22 0QL |
| Oz Limited | JE3 9FR |
