| C & E Vine Labours Ltd. | Bordon | 2016 |
| C & EA Futter Limited | Spalding | 2012 |
| C & G a GUY Contractors Limited | Colne | 2004 |
| C & G Produce Limited | Harlow | 1997 |
| C & H Ford Farm Ltd | Crediton | 2015 |
| C & H Holland Limited | Thame | 2014 |
| C & H Stephenson Ltd | Leeds | 2026 |
| C & I Wade Limited | Bridlington | 2008 |
| C & J Carmichael Limited | Isle Of Lismore | 2015 |
| C & J Contracting Limited | Barnoldswick | 2013 |
| C & J Control Services Ltd | Glasgow | 2022 |
| C & J Dornom Limited | Somerset | 2003 |
| C & J Fishing Company Ltd | Weisdale | 2025 |
| C & J Pittendrigh Limited | West Calder | 2003 |
| C & J Shellfish Limited | Tarbert | 2007 |
| C & J Wildlife Management Limited | Preston | 2013 |
| C & JD Limited | Aberdeenshire | 2007 |
| C & K Fishing Company Ltd | Paisley | 2025 |
| C & K Mobile Milling Services Limited | Exeter | 2003 |
| C & K Morton (Farmers) Limited | Warwickshire | 2002 |
| C & K Tree and Gardening Services Ltd | Ottery St. Mary | 2025 |
| C & K Wood (U.K.) Limited | North Yorkshire | 2001 |
| C & L Contracting Limited | Bridport | 2013 |
| C & M Agri Limited | Hereford | 2020 |
| C & M Denness Limited | York | 2001 |
| C & M Evans Ltd | Barry | 2023 |
| C & M Mccann Ltd | Tobermore | 2014 |
| C & M Nutrition Ltd | Hereford | 2010 |
| C & M Symons Ltd | Kelso | 2004 |
| C & N Hobson Limited | York | 1991 |
| C & P Bird Bros. Limited | Swineshead | 1977 |
| C & R Tree Care & Garden Services Ltd | Tadley | 2025 |
| C & S Bloodstock Ltd | Stratford-Upon-Avon | 2017 |
| C & S Cleaners Limited | Norwich | 2003 |
| C & S Farming Limited | Brechin | 2016 |
| C & S J Taylor Limited | King'S Lynn | 2017 |
| C & S Malpass Limited | Stafford | 2005 |
| C & W Contracting Limited | Taunton | 2011 |
| C & W Webber (Amners Farm) Limited | Reading | 2003 |
| C a Agriculture Ltd | Huntingdon | 2008 |
| C a Cook & Co Ltd | Thatcham | 2026 |
| C a Farming Limited | Nottingham | 2023 |
| C a L & M Upton Limited | Heskin | 2006 |
| C a Lime Ltd | Huntingdon | 2013 |
| C a Webster & SON (Farms) Limited | Oswestry | 1997 |
| C a Worley Farming Ltd | Tenterden | 2017 |
| C and D Contracting Limited | Hungerford | 2007 |
| C and S Fisheries Ltd | Brixham | 2026 |
| C and T K Farm Limited | Castlederg | 2011 |
| C and V Loane Limited | Enniskillen | 2004 |
| C B Agricultural & Groundwork Contractors Limited | Northwich | 2021 |
| C B Jones Ltd | Builth Wells | 2014 |
| C B Read Agricultural Solutions Ltd | Maidstone | 2024 |
| C B Thompson Limited | Grantham | 2022 |
| C Beattie and SON Limited | Ferryhill | 2012 |
| C C Contractors Limited | Lincoln | 2002 |
| C C Denness UK Limited | Newmarket | 2012 |
| C Cappalonga and SON Limited | Roydon | 2010 |
| C Clark Contracting Limited | Wisbech | 2018 |
| C D Brace & Sons Limited | Peterborough | 2012 |
| C D C Blowers Limited | Saxmundham | 2009 |
| C D Equestrian Limited | Solihull | 2023 |
| C Davies Groundworks Limited | Welshpool | 2026 |
| C Dicks and Sons Limited | Kettering | 1999 |
| C E Izod Ltd | Chipping Norton | 2015 |
| C E Cobb & Sons Limited | Nr Newark | 1964 |
| C F E Agri Ltd | Nantwich | 2022 |
| C F Freelance Limited | Southampton | 2025 |
| C F Middleton Limited | Lincolnshire | 2008 |
| C F Ridout & SON Limited | Yeovil | 2012 |
| C Fisher & Sons Limited | Bedford | 2025 |
| C G & D Heal Limited | Bristol | 1988 |
| C G & K D Briggs Ltd | Taunton | 2018 |
| C G Dominic Ltd | Liskeard | 2014 |
| C G Harper Ltd | Cambridge | 2016 |
| C G Purchase and SON Limited | Wimborne | 1958 |
| C Gray Ltd | Four Marks | 2017 |
| C H Champion & Partners Limited | Highbridge | 2003 |
| C H Contracting Limited | Duns | 2000 |
| C H L Sheds Limited | Nottingham | 2014 |
| C H Stephenson & Sons Limited | York | 2003 |
| C H Stokes Tree Surgery and Fencing Ltd | Monmouth | 2017 |
| C Hillier Tree Contractors Ltd | Leatherhead | 2025 |
| C Hodge Limited | Oban | 2000 |
| C Horsley Limited | Workington | 2009 |
| C Howard Contracting Limited | Sudbury | 2014 |
| C I Fishing Ltd | Whalsay | 2023 |
| C Irvine & Sons Agri and Plant Hire Limited | Crumlin | 2023 |
| C J & L M Davies Ltd | Shrewsbury | 2011 |
| C J ARB Ltd | Hassocks | 2026 |
| C J Ashby Limited | Maldon | 2023 |
| C J Baird Limited | Dumfries | 2021 |
| C J Countryside Ltd | Diss | 2023 |
| C J Crang and SON Ltd | Yeovil | 2014 |
| C J Elcock Limited | Selby | 2018 |
| C J Equestrian Limited | High Wycombe | 2023 |
| C J Equine Services Limited | Beaminster | 2018 |
| C J Gaunt Services Ltd | Stourport-On-Severn | 2012 |
| C J Green & SON (Maxstoke) Limited | Tamworth | 1994 |
| C J Kendall Ltd | Nottingham | 2014 |