- Atimpex Ltd - London
- Atkins Ltd - London
- Atlantic Electrics - London
- Atlantic Security - London
- ATMT Group plc, The - London
- Atocloud - London
- Atomic Build - London
- Atos IT Services UK Ltd - London
- Atrium Ltd - London
- Audio Partnership Plc - London
- Audio Visual Systems Ltd - London
- Audiolink Ltd - London
- Augmentiq - London
- Augmetic - London
- Aussie Man & Van - London
- Austin Benn Consultants Ltd - London
- Austin Office Furniture Ltd - London
- Autocar Electrical Equipment Co. Ltd - London
- Autograph Sound Recording Ltd - London
- Autopost Ltd - London
- AV Hire Company - London
- Avel Lindberg 2002 Ltd - London
- Avenue5 Consulting - London
- Averox Europe Ltd - London
- Aviacircle - London
- Aviation Environment Federation - London
- Avis Appleton & Associates - London
- Avolites - London
- Award Apparel Plc - London
- Axcess IT Ltd - London
- Axis Elevators Ltd - London
- Ayrton Windows & Doors - London
- Azad Electricals - London
- Azanatek Ltd - London
- B & R Carpet Company - London
- B & S Steel Supply Ltd - London
- B & W Darts & Trophies - London
- B D O Stoy Hayward Chartered Accountants - London
- B D S Sponsorship Ltd - London
- B E A M A Ltd - London
- B E C Perimeter Security Ltd - London
- B E W Electrical Distributors Ltd - London
- B J Waters Electrical Contractors - London
- B L L Associates Ltd - London
- B S I Product Services - London
- B S I Standards - London
- B S S Pipeline & Heating Solutions - London
- B S Security - London
- B T G PLC - London
- B&F Services - London
Companies 351 to 400
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