| C J Middleton Limited | Cromarty | 2000 |
| C J Pallets Ltd | Wakefield | 2011 |
| C J Patisserie Limited | Witham | 2020 |
| C J Reed Engineering Ltd | Northampton | 2018 |
| C J Rose Limited | Rye | 2002 |
| C J S Safety Systems Limited | Nuneaton | 2003 |
| C J Shellfish Limited | Portland | 2011 |
| C J Signs Limited | Sheffield | 2011 |
| C J Spares Limited | Stratton Strawless | 1993 |
| C J Tool and Mouldings Limited | Stourbridge | 2007 |
| C J Vander Ltd | Romney Marsh | 2013 |
| C J W Welding & Fabrication Limited | Basildon | 2017 |
| C J Ward Joinery Manufacturer Limited | Nottinghamshire | 2006 |
| C J Wildbird Foods Limited | Shrewsbury | 1987 |
| C J Wind Height Tech Limited | Middlesbrough | 2019 |
| C J Y Carpentry Limited | Daventry | 2019 |
| C Jarvis Ltd | Sunderland | 2014 |
| C Jones Building Ltd | Llanymynech | 2025 |
| C J`S Specialist Vehicles Ltd | Essex | 2008 |
| C K Bamboo Limited | Peterborough | 2025 |
| C K Carpenters (Essex) Limited | Rochford | 2019 |
| C K Composites Ltd | Romsey | 2023 |
| C K Electronics (UK) Limited | Birmingham | 2016 |
| C K Fires Limited | Stratford-Upon-Avon | 2005 |
| C K M Design Ltd | Bognor Regis | 2025 |
| C K Precision Engineering Limited | Great Yarmouth | 2000 |
| C K Safety Limited | York | 1992 |
| C L Electrical (Yorkshire) Ltd | Leeds | 2021 |
| C L Fabrications (UK) Ltd | Brough | 2012 |
| C L Flint Ltd | Immingham | 2024 |
| C L Heating Express Limited | Enfield | 2019 |
| C L Paper Sales Company Limited | London | 1978 |
| C L S Upholstery Services Limited | Trowbridge | 2021 |
| C L Steel Fabrication Limited | Retford | 2007 |
| C L Trickett Limited | Crowborough | 2020 |
| C LEE Engineering Ltd | Kilwinning | 2026 |
| C M Blasting Services Ltd | Dungannon | 2020 |
| C M Carpentry Ltd | Ipswich | 2025 |
| C M Coatings Limited | Hereford | 2007 |
| C M Cooling Control Ltd | Little Waltham | 2017 |
| C M Electrical & Property Services Limited | Sittingbourne | 2024 |
| C M Engineering Consultants Limited | Worcester | 2008 |
| C M G Security Limited | South Yorkshire | 2004 |
| C M Graphics Limited | Ryton | 2015 |
| C M Hutton Blacksmiths Ltd | Glasgow | 2023 |
| C M I Consultant Limited | Northampton | 2012 |
| C M Kerr Ltd. | Millerhill | 2007 |
| C M Leveret Ltd | London | 2020 |
| C M N (London) Limited | 112A-116 Chorley New Road | 1961 |
| C M Print Limited | Brighton | 2001 |
| C M Printing Limited | | 1982 |
| C M T P Ltd | Yeovil | 1986 |
| C M Varley & Co Limited | Oswestry | 1947 |
| C Mack Access Limited | Carnoustie | 2011 |
| C Mark Ltd | Southall | 2021 |
| C Marsh Tooling Services Ltd | Spalding | 2015 |
| C Marston Electrical Ltd | Middlesbrough | 2017 |
| C Mason Engineering & Co Ltd | Downpatrick | 2023 |
| C Mccormick Ltd. | Glasgow | 2012 |
| C Millar & SON Fabrications Limited | Plymouth | 2010 |
| C N C Speedwell Limited | Brownhills | 1995 |
| C N C Technology Limited | Bromsgrove | 2009 |
| C N C Tool & DIE Limited | Lisburn | 2005 |
| C N G Designed Interiors Limited | Nottinghamshire | 2002 |
| C N Gilbert Ltd | Dalry | 2013 |
| C N L Maintenance Limited | Stoke-On-Trent | 2025 |
| C N Metal Works Limited | Preston | 2011 |
| C O Interiors Limited | Glasgow | 2024 |
| C O'Neill Fabrications Limited | | 2007 |
| C Ottley Ltd | Woodford Green | 2026 |
| C P Blasting Ltd | Chesterfield | 2003 |
| C P Carpentry & Timber Framing Ltd | Shrewsbury | 2016 |
| C P Cases Limited | Canterbury | 1973 |
| C P Fabrications (Lancs) Ltd | Colne | 2013 |
| C P Fabs Limited | Halesowen | 2004 |
| C P Holland & Sons Limited | Halifax | 2002 |
| C P Joinery Limited | Southam | 2020 |
| C P Northern Limited | Bradford | 2014 |
| C P Pharmaceuticals Limited | Wrexham | 1950 |
| C P S (Cannock) Ltd | Staffordshire | 1990 |
| C P S Rail Ltd | Basildon | 2007 |
| C P S Upholstery Ltd | Leigh-On-Sea | 2021 |
| C P U - Contract Polishing Upholstery Ltd | Oldham | 2019 |
| C P Vaudin Limited | Driffield | 2001 |
| C Pack Pendle Limited | Burnley | 2008 |
| C Parducci Wholesale Limited | Johnstone | 2005 |
| C Perkin Limited | Batley | 2023 |
| C Plant Services Ltd | Liverpool | 2026 |
| C Print Media Limited | Leigh-On-Sea | 2011 |
| C R Agritech Ltd | Turriff | 2025 |
| C R Atkinson & Sons Limited | Newton Aycliffe | 2002 |
| C R Carey Limited | Billingshurst | 2015 |
| C R Carpentry & Construction Limited | Fakenham | 2016 |
| C R Design 2000LTD Ltd | Leeds | 2025 |
| C R F (UK) Limited | Wem | 2003 |
| C R F Sections Limited | Dudley | 1991 |
| C R Fenwick Commercials Ltd | Scunthorpe | 2012 |
| C R Heating Solutions Limited | Bilston | 2021 |
| C R Poole Engineering Ltd | Worthing | 2016 |
| C R S Engineering Limited | Cramlington | 2003 |