- B.N.A. International Inc - London
- B.R.I.S. GROUP - London
- B2B Marketing - London
- B3 Designers - London
- Babycare TENS Ltd - London
- Backstore Contracts Division - London
- Baddeley Brothers Ltd - London
- Bahamas Maritime Authority - London
- Balcan Flooring & Paint Trade Ltd - London
- Balham Carpet Cleaners Ltd - London
- Balham Removals - London
- Balls Pond Joinery - London
- Balthorne Safe Deposit Centres - London
- Balthorne Security Solutions - London
- Baltic Exchange Ltd - London
- Banbury Howard - London
- Banham Group - London
- Banking Solutions Ltd - London
- Banner Buzz - London
- Barbara Genda - London
- Bare Escentuals UK - London
- BaristaBARBAR - London
- Barking Dog Security Ltd - London
- Barnard & Associates - London
- Barnes Hire City Ltd - London
- Barnett Lawson (Trimmings) Ltd - London
- Barry Bros Security - London
- Barry Brothers Security Ltd - London
- Baruch Enterprises Ltd - London
- bar-x.com - London
- Baryon Media Pvt. Ltd. - London
- Baseel - London
- Basis Lighting - London
- Bastion Europe Ltd - London
- Bastion Security Ltd - London
- Bates Alarms - London
- Bathroom Goals Ltd - London
- Batteries Direct - London
- Battersea Floor Sanding - London
- Battersea Removals - London
- Bauerfeind UK - London
- Baume & Co. - London
- Bayleaf Janitorial Supplies Ltd - London
- Baylight Properties PLC - London
- BBC Visual Effects - London
- B-DATA Ltd - London
- BDRC Continental - London
- Be Social - LONDON
- Beacon Private Trust - LONDON
- Bear Nibbles - London
Companies 401 to 450
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