| O2 Creative Ltd | Norwich | 0870 165 2212 |
| Oakbase plc | Chester | 01244 391391 |
| Oakbase plc | Chester | 01244 391391 |
| Oakley Design Management | Newark | 01636 812592 |
| Oakley Wilkinson Bryan Ltd | Birmingham | 0121 333 5200 |
| Oakthrift Plc | Borehamwood | 020 8327 0222 |
| Oakwood Design Consultants | Bristol | 0117 983 6789 |
| Oasis Communications | London | 020 7637 5060 |
| The Observatory International Ltd | London | 020 7847 4035 |
| Observer Standard Newspapers Ltd | Redditch | 01527 588688 |
| OC Group | East Cowes | 0870 063 0210 |
| Patrick O'Callaghan Graphic Design | London | 020 8994 6477 |
| Occam Direct Marketing Ltd | Radstock | 01761 233833 |
| Ocean Advertising Ltd | London | 020 7631 0800 |
| Ocean Design | London | 020 7670 2370 |
| Ocean Media Group Ltd | Coventry | 024 7657 1171 |
| O'Connor HR Partner | York | 01347 823821 |
| Octagon | London | 020 7862 0000 |
| Octagon Exhibition Ltd | Cottingham | 01482 840533 |
| Octagon (NI) Ltd | Bangor | 028 9147 9400 |
| Octanorm UK | London | 020 8545 2945 |
| Oculus Design & Communications Ltd | Reading | 0118 958 9815 |
| OCW Advertising & Marketing | Elland | 01422 311007 |
| Odd | London | 020 7663 1790 |
| Odessa Offset Ltd | London | 020 8778 7888 |
| odm ltd | St Albans | 01582 831693 |
| ODS Business Services | Swindon | 01793 421300 |
| ODS Business Services | Swindon | 01793 421300 |
| Ofcom (Office of Communications) | London | 020 7981 3000 |
| Office of Fair Trading (OFT) | London | 020 7211 8000 |
| Office for National Statistics (ONS) | London | 020 7533 5702 |
| Michael Ogden | Bristol | 0117 924 8376 |
| Ogilvy Action | London | 020 7108 6105 |
| Ogilvy Advertising | London | 020 7345 3000 |
| Ogilvy Healthworld Advertising | London | 020 7108 6100 |
| Ogilvy Primary Contact | London | 020 7468 6900 |
| OgilvyOne Worldwide Ltd | London | 020 7566 7000 |
| Ohal Ltd | London | 020 8318 7321 |
| Old Smithy Recording Studios | Worcester | 01905 820659 |
| Oldeani Ltd | Chelmsford | 01245 262611 |
| Olive 360° Ltd | London | 020 7403 7603 |
| Oliver & Graimes Design Associates Ltd | Hove | 01273 748884 |
| Olympic Promotional Watches Ltd | Wickford | 01268 561838 |
| Olympus Designs (T-shirts) | Balasalla | 01624 825396 |
| Olympus (UK) Ltd | Watford | 01923 831215 |
| OMD International (UK) | London | 020 7908 3400 |
| OMD TVi | London | 020 7893 4893 |
| Omega Import Export Ltd | Wembley | 020 8902 6222 |
| Omega Print & Design | Stockport | 0161 456 8624 |
| Omobono Ltd | Cambridge | 01223 307000 |
| On-Screen Graphics | Oxford | 01865 204417 |
| On TV & Radio | Rotherham | 01709 331221 |
| One Advertising | Harrogate | 01423 701711 |
| One Brand Group | Tetbury | 01453 835516 |
| One Brand Group | Tetbury | 01453 835516 |
| One Creative Group Northwest | Stockport | 0161 482 4589 |
| One Ltd | Oxford | 01865 200200 |
| One World Crystal Ltd | Bristol | 0117 938 0033 |
| One1000 Ltd | Shepperton | 01932 593593 |
| One2Six Creative Ltd | London | 020 8896 8550 |
| Simon O'Neill Design & Promotions | Northampton | 01933 664381 |
| Onesimus | Windermere | 01539 439399 |
| OneSource Information Services | London | 020 7415 7700 |
| Online Media Group Ltd | Norwich | 01603 697700 |
| Only Horses Picture Agency | Greenford | 020 8578 9047 |
| onlyfolders.com | Leeds | 0113 272 0088 |
| Ontrac 360 | Bristol | 01275 850900 |
| Ontrack Marketing Ltd | London | 020 7569 3077 |
| Oomph | Cirencester | 01285 883790; 07713 642735 |
| The Open Agency | London | 020 7740 7000 |
| Open Doors Ltd | London | 07738 226111 |
| OpenContact | Norwich | 0870 442 3450 |
| Opera Telecom | Birmingham | 08081 313131 |
| Opinion Matters | London | 020 7251 9960 |
| Opinium | London | 020 7566 3190 |
| OPLdigital | Sevenoaks | 01732 746677 |
| Stanli Opperman | London | 020 7794 3181 |
| OpSec Security Group plc | Leicester | 0116 282 2000 |
| OPTI | Luton | 01582 411413 |
| Optima Co. Ltd | Pulborough | 01903 744111 |
| Optima UK Ltd | Epping | 0870 442 0022 |
| Optimad Media Systems | London | 020 7468 6650 |
| Optimiser | Edinburgh | 0845 652 1000 |
| Opto International Ltd | Stalybridge | 0161 330 9136 |
| Opus Creative Marketing | Towcester | 01327 810400 |
| Opus Creative Marketing | Towcester | 01327 810400 |
| OPX | London | 020 7729 6295 |
| Orange20 Ltd | London | 020 7321 0701 |
| Orbital Design Ltd | Bournemouth | 01202 304455 |
| ORC International | London | 020 7675 1000 |
| ORCA Promotional Packaging | Cambridge | 01223 316603 |
| Orchard Ltd | West Drayton | 01895 421341 |
| Orchard Toys Ltd | Wymondham | 01953 423422 |
| Orckid Design & Marketing Ltd | Staines | 01784 426999 |
| Ordnance Survey | Southampton | 023 8079 2000 0845 6050 505 |
| The Organisation | London | 020 7833 8268 |
| Organised Chaos | Kings Langley | 0870 011 1210 |
| Origin Brand Consultants Ltd | East Molesey | 020 8941 5811 |
| Origin Hospitality Ltd | London | 020 7736 5400 |
| Origin Publishing | Bristol | 0117 927 9009 |
| The Original Book Works Ltd | Cirencester | 01285 641664 |
| The Original Metal Sign Company Ltd | Leeds | 0113 286 7533 |
| Orion Marketing | Baildon, Shipley | 01274 581222 |
| The Orion Publishing Group Ltd | London | 020 7240 3444 |
| Orion Security Print Ltd | Ilkeston | 0115 930 7517 |
| Ortak Jewellery Ltd | Kirkwall | 01856 872224 |
| Ortus Interim Solutions | London | 020 7556 2980 |
| Osmosis Marketing Communications Ltd | Harpenden | 01582 716200 |
| O'Sullivan Printing Corporation | Southall | 020 8606 9839 |
| Other Creative Ltd | London | 020 7600 9339 |
| The Other Media Ltd | London | 020 7089 5959 |
| OTL Ltd | St Helier, Jersey | 01534 725521 |
| OTM Create | London | 020 7478 4400 |
| Out-Think (part of Poulter Partners) | Leeds | 0113 285 6500 |
| Outback Barbecue | Maidstone | 01622 671771 |
| Outbound TMP | Southend-on-Sea | 01702 434555 |
| Outburst Creative Ltd | London | 020 7713 6500 |
| Outdoor Advertising Association of Great Britain Ltd (OAA) | London | 020 7973 0315 |
| Outdoor Advertising Council (OAC) | Bristol | 0117 904 7235 |
| Outdoor Media Association (OMA) | Greystones | +353 1 201 6760 |
| Outer Sanctum Ltd | London | 020 7407 1407 |
| Outline Design & Advertising Ltd | Andover | 01264 388268 |
| Outmere DM Ltd | London | 020 8947 7577 |
| Outside the Box Plc | Leeds | 0113 216 2820 |
| Oversolve Ltd | Nottingham | 0115 941 0600 |
| The Owen Agency | Havant | 023 9248 6566 |
| P. M. Owen Advertising | Birmingham | 0121 440 5574 |
| OWM & M Design Ltd | Battle | 01424 777192 |
| Oxford Cartographers (CHK Ltd) | Oxford | 01865 882884 |
| Oxford Designers & Illustrators | Oxford | 01865 512331 |
| The Oxford Partnership Ltd | Oxford | 01865 316317 |
| Oxford Picture Library | Oxford | 01865 723404 |
| Oxford Scientific (OSF) | London | 020 7836 5591 |
| Oxygen Creative Services Ltd | Tiverton | 01884 255999 |
| Oxygen Creative Solutions | Entreprise Way NG2 Business Park | 0115 986 7000 |
| Oxygen Marketing Ltd | London | 020 7731 2288 |
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