- Hybrid Healthcare - London
- Hyde Park Residence - London
- Hydraulic Fleet Solutions - London
- HY-MAC - London
- Hymas Refrigeration - London
- Hyper WISP - London
- Hyphen Design Ltd - London
- I C T S UK Ltd - London
- I D C Holdings Ltd - London
- I Franks - London
- I I E D - London
- I Smart Business Solutions - London
- I T C Secure Networking - London
- I.V.M Builders Ltd - London
- iACS - London
- Ian Sayer & Co. - London
- IBA ColourView - London
- IBP AUTOMATION LTD - London
- IBSC - London
- IBU CONSULTING LTD - London
- iC2 CCTV and Security Specialists - London
- iceBackup Online Backup Systems - London
- iCentric Agency - London
- ICM Capital - London
- Ico Management Services - London
- Icon Printing - London
- Icon Surveyors - London
- Iconic Brand Agency - London
- Icore - London
- ID Card Printer - London
- IDAS Consulting & Trading - London
- Ideo - London
- IDM Dispenser UK Limited - London
- Idocz - London
- IDscan - London
- Idxtra - London
- iEngine Ltd - London
- IG Smart Ltd - London
- Ignicious Digital Marketing Agency - London
- Ignite Design - London
- IKA EPoS Solutions - London
- iLease Ltd - London
- ILJ Logistics - London
- Illustration Ltd - London
- Image Line Communications Ltd - London
- Image Line Exhibitions - London
- ImageFast Ltd - London
- Imagestor - London
- imakr - London
- Imanova - London
Companies 1851 to 1900
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