| 1st Engineering Group | Avon & Somerset Constabulary | Bizspace Ltd |
| ABP Ports plc | AWE Aldermaston | Bluestone plc |
| Aittricity Developments Ltd | AXA Insurance Plc | BMH Construction |
| Al Saylegh Group Real Estate | Aylesford Newsprint Ltd | BOC Edwards |
| Alcan Chemicals | B&Q plc | Bombardier |
| Aldi Stores Ltd | BAA plc | Bond Pearce |
| Alligan Ltd | Baillie Windfarm | Borough Council of Wellingborough |
| AMEC Group | Banner Holdings | Bovis Homes Ltd |
| Anastasia Ltd | Banner Homes Ltd | Bowmer & Kirkland |
| Anglia Regional | Barchester Care Village | BP International |
| Apollo Capital Projects | Barnet Football Club | British Land |
| Arena Leisure Plc | Barratt Developments plc | British Standards Council |
| Argent Group plc | Bedfordshire County Council | Broadlands Wolverhampton |
| Argos | Bellway Homes | Buckinghamshire County Council |
| Arlington Group | Bellway Homes (North East) | Build Store |
| Arriva Trains | Berkeley Homes | Building Images |
| Asda Stores Ltd | Bett Homes (North East) | Bunting & Sons |
| Ashwell Developments Ltd | Biffa Waste Services | BUPA Care Services |
| Ask Developments | Big Yellow Property Co | |
| Astral Developments | Bird Group Company |