- Cinemasonics - Audio Visual & Network Installations - London
- Circle Car Service - London
- Cirencester Stone Ltd - London
- CIS Security - London
- Citi Guards - London
- Citibase PLC - London
- CitiGuards Ltd - London
- Citroen Wolf Publishing Group - London
- City Binders - London
- City Capital Consulting Ltd - London
- City Keyholding Ltd - London
- City Lock & Safe - London
- City Moving & Storage - London
- City Ring Binders Ltd - London
- City Site Solutions Ltd - London
- City Telecom - London
- Citywatch Security Services Ltd - London
- Citywide Cleaning Services - London
- Civica Services Ltd - London
- Clapham Cleaners Ltd - London
- Clarion Events Ltd - London
- Clark Electrical - London
- Clarke International - London
- Clarkin's Car Accessories Ltd - London
- Clarus Digital Ltd. - London
- Class Instrumentation Ltd - London
- Classic Fine Foods - London
- Classic Sound Ltd - London
- Classic Upholstery - London
- Classroom365 - London
- Clean For Less London - London
- Clean Secure Watch - London
- Clean Team - London
- Cleanergy Services Ltd - London
- Cleaning 24x7 - London
- Cleanology - London
- Clear House Accountants - London
- Clear It Waste - London
- Clear Review - London
- Clear Sound & Vision - London
- Cleardata UK Ltd - London
- clearitwaste - London
- Clear-peoplesafe - London
- Clearworld Health & Safety Ltd - London
- Clement Acoustics Ltd - London
- Clerkenwell Print by Atlantis Print - London
- Cleshar - London
- Clever Signs - London
- Client Earth - London
- Clifford Devlin Ltd - London
Companies 801 to 850
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