- Insulationbee LTD - London
- Intagleo Systems UK LTD - London
- Intaglio Printmaker - London
- Integrated Electrical Services - London
- Integrated Visual Protection - London
- Integrations t/u Sam Kane Ltd - London
- Integrity Governance - London
- Intellect - London
- Intellectsoft LTD - London
- Intellicasa Limited - London
- Inter Voice Over UK Ltd. - London
- Interform Contract Furniture - London
- Interloom Ltd - London
- International (UK) Ltd - London
- International Business Times UK - London
- International Data Group Inc - London
- International Safety Consultants - London
- International Sugar Organization - London
- Interr - London
- Interspace Ltd - London
- Interstage (Stage Hire) - London
- Intsys - London
- Intu Property - London
- Intuition - London
- Invata - London
- Invedus Ltd - London
- Invensys - London
- Inventive Consultants - London
- Inventory Clerks 4U - London
- IP 21 Ltd - London
- IP-Coster Ltd - London
- Ipsotek - London
- Ireland Removals - London
- Iron Age Metalworks - London
- Ironclad Security - London
- IS Global Web - London
- IT Cleaning - London
- IT Enterprise - London
- IT Enterprise Business Solutions - London
- It is Made in Europe - London
- Ital Cutlery Services Ltd - London
- Iteba - london
- ITIL Success - London
- Ivory Research - London
- Ixian Solutions Ltd - London
- J & J Stern LLP - London
- J B Riney & Company Ltd - London
- J D McDougall - London
- J F K Ltd - London
- J Farley Contracts - London
Companies 1951 to 2000
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