| odm ltd | St Albans | 01582 831693 |
| ODS Business Services | Swindon | 01793 421300 |
| ODS Business Services | Swindon | 01793 421300 |
| OMD International (UK) | London | 020 7908 3400 |
| OMD TVi | London | 020 7893 4893 |
| OP Graphics (Holography) Ltd | Leeds | 0113 262 8687 |
| OPX | London | 020 7729 6295 |
| ORT House Conference Centre | London | 020 7446 8509 |
| OTM Create | London | 020 7478 4400 |
| OWM & M Design Ltd | Battle | 01424 777192 |
| Oakbase plc | Chester | 01244 391391 |
| Oakley Design Management | Newark | 01636 812592 |
| Oakmere Conference Centre | Liverpool | 0151 280 5704 |
| Oakthrift Plc | Borehamwood | 020 8327 0222 |
| Oakwood DC | Bristol | 0117 983 6789 |
| Oatlands Park Hotel | Weybridge | 01932 847242 |
| Observer Standard Newspapers Ltd | Redditch | 01527 588688 |
| Patrick O'Callaghan Graphic Design | London | 020 8994 6477 |
| Occam Direct Marketing Ltd | Radstock | 01761 233833 |
| Ocean Media Group Ltd | Coventry | 024 7657 1171 |
| O'Connor HR Partner | York | 01347 823821 |
| Octagon Exhibition Ltd | Cottingham | 01482 840533 |
| Octagon Marketing | London | 020 7862 0000 |
| Octanorm UK | London | 020 8545 2945 |
| Odell-Crosslee PLC | Flint | 01344 891428 |
| Odessa Offset Ltd | London | 020 8778 7888 |
| Odyssey Arena | Belfast | 028 9076 6000 |
| Office for National Statistics (ONS) | London | 020 7533 5702 |
| The Office of Communications (Ofcom) | London | 020 7981 3000 |
| Office of Fair Trading (OFT) | London | 020 7211 8000 |
| Offsite Associates | West Malling | 01732 875305 |
| Michael Ogden | Bristol | 0117 924 8376 |
| OgilvyOne | London | 020 7566 7000 |
| OgilvyOne Worldwide Ltd | London | 020 7566 7000 |
| Ohal Ltd | London | 020 8318 7321 |
| Old Course Hotel, Golf Resort & Spa | St Andrews | 01334 474371 |
| The Old Government House Hotel & Spa | Guernsey | 01481 724921 |
| The Old Smithy Recording Studios Ltd | Worcester | 01905 820659 |
| The Old Swan Hotel | Harrogate | 01423 500055 |
| The Old Truman Brewery | London | 020 7770 6100 |
| Oldeani Ltd | Chelmsford | 01245 262611 |
| Tim O'Leary | London | 020 7402 2924 |
| Olive 360° Ltd | London | 020 7403 7603 |
| Oliver & Graimes Design Associates Ltd | Hove | 01273 748884 |
| Olympic Promotional Watches Ltd | Wickford | 01268 561838 |
| Olympus (UK) Ltd | London | 020 7253 2772 |
| Olympus Designs (T-shirts) | Balasalla | 01624 825396 |
| Omarketing Ltd | Teddington | 020 8255 5225 |
| Omega Import Export Ltd | Wembley | 020 8902 6222 |
| Omega Print & Design | Stockport | 0161 456 8624 |
| One & Only Resorts | Gerrards Cross | 01753 899800 |
| One2Six Creative Ltd | London | 020 8896 8550 |
| One Birdcage Walk | London | 020 7973 1248 |
| One Brand Group | Tetbury | 01453 835516 |
| One Great George Street | London | 020 7665 2323 |
| One World Crystal Ltd | Avonmouth | 0117 938 0033 |
| Oneida International | London | 020 8450 8900 |
| 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 |
| On-Screen Graphics | Oxford | 01865 204417 |
| Onyx-Art | London | 020 8202 3454 |
| The Open Agency | London | 020 7740 7000 |
| Open Doors Ltd | London | 07738 226111 |
| OpenContact | Norwich | 0870 442 3450 |
| Opera Telecom | Birmingham | 08081 313131 |
| OPLdigital | London | 020 7872 5696 |
| 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 U K Ltd | Epping | 0870 442 0022 |
| Optimad Media Systems | London | 020 7468 6650 |
| Optimiser | Edinburgh | 0845 652 1000 |
| Optimize Search Engine Marketing | London | 020 8879 3180 |
| Options Conference & Booking Agency | Shanklin | 01983 864677 |
| Opto International Ltd | Stalybridge | 0161 330 9136 |
| Orbital Design Ltd | Bournemouth | 01202 304455 |
| Orchard Toys Ltd | Wymondham | 01953 423422 |
| Ordnance Survey | Southampton | 023 8079 2000 |
| The Organisation | London | 020 7833 8268 |
| Organised Kaos | 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 |
| The Other Media Ltd | London | 020 7089 5959 |
| Outback Barbecue | Maidstone | 01622 671771 |
| Outbound TMP | Southend-on-Sea | 01702 434555 |
| 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 |
| Outmere DM Ltd | London | 020 8947 7577 |
| Outside the Box Plc | Leeds | 0113 216 2820 |
| Outsourced Events Ltd | London | 020 8995 9495 |
| Out-Think (part of Poulter Partners) | Leeds | 0113 285 6500 |
| Ovation Group | Belfast | 028 9045 6451 |
| Overseas Press & Media Association (OPMA) | Cambridge | 01223 512631 |
| Oversolve Ltd | Nottingham | 0115 941 0600 |
| 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 Films Photo Library | Thame | 01844 262370 |
| Oxygen Marketing Ltd | London | 020 7731 2288 |
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