- WSP Group plc - London
- X G Plastic Fabrications - London
- Xact Accountants - London
- Xavier Auto Clinic - London
- Xela Technologies Ltd - London
- XFOR Group - London
- Xinix - London
- XIST4 IT Recruitment - London
- Xpress Decorators - London
- X-Ray Surveys - London
- XS CAD Limited - London
- Yakety Yak - London
- Yasmeen Creative - London
- Yellow Jacket - London
- You Choose - London
- You Do The Shoot - London
- Your Company Formations Limited - London
- Yuvilite - London
- Z Buses Limited - London
- Zada - London
- Zeal Clean Supplies Ltd - London
- Zedonk - London
- Zeefax Ltd - London
- Zelo Digital Recruitment - London
- Zeon Ltd - London
- Zepbrook Ltd - London - London
- Zi Technical Services - London
- Zolmi Salon software UK - London
- Zone Creations - London
- Zones UK - London
- ZRP Architects - London
Companies 4001 to 4031
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