| D & E Lewis Consultancy Limited | London | 2003 |
| D & G Sports Ltd | Beckenham | 2018 |
| D & P Happy Days Limited | Tayside | 2008 |
| D & R Childcare Limited | Leeds | 2009 |
| D & V Educators Limited | Southall | 2016 |
| D Ace Academy Ltd | London | 2023 |
| D Archer Ltd | Southport | 2021 |
| D B Theissen Limited | Weybridge | 2014 |
| D Bolly Dance Company Ltd | Ilford | 2025 |
| D C Plant Training Ltd | Tain | 2022 |
| D D a International Limited | Sutton | 2003 |
| D E and a Academy Limited | Faversham | 2024 |
| D Edge Training Ltd | Wakefield | 2019 |
| D Evans Plant Training Ltd | Aberdare | 2022 |
| D F Coaching Limited | Yarm | 2014 |
| D G F Training Limited | Grays | 2016 |
| D G Sports Consultancy Limited | St. Albans | 2014 |
| D Hoffbrand Ltd | Hove | 2006 |
| D Horst Driving School Limited | Newcastle Upon Tyne | 2025 |
| D I Leicester Ltd | Leicester | 2020 |
| D J Learning and Skills Associate Ltd | Southampton | 2024 |
| D J Learning Ltd | Port Talbot | 2010 |
| D J Training & Asbestos Consultants Limited | York | 2016 |
| D Jelfs Tuition Limited | Birmingham | 2017 |
| D Jones Golf Academy Limited | Cobham | 2022 |
| D K Learning Connections Ltd | Redditch | 2018 |
| D L Buckley Limited | Chesterfield | 2003 |
| D L Clewes Limited | Little Brington | 2009 |
| D L Hayes Education Services Ltd | London | 2025 |
| D Learning Excellence Limited | East Ham | 2026 |
| D M Heritage Ltd | Selby | 2009 |
| D M Learning Limited | Congleton | 2023 |
| D M London Limited | Birmingham | 2017 |
| D M T Consultancy Limited | Gloucester, | 2007 |
| D M Training Consultants Limited | Stonehaven | 2005 |
| D N a Apprenticeships Ltd | Norwich | 2016 |
| D N a Courses Ltd | Colchester | 2018 |
| D N D Training and Consultancy Ltd | Warrington | 2024 |
| D N P L Limited | London | 2016 |
| D P Football Academy Ltd | Newark | 2021 |
| D P Football School Ltd | Newark | 2019 |
| D P Tuitions Limited | Manchester | 2018 |
| D Performance Academy Ltd | London | 2025 |
| D R Harrison Ltd | Louth | 2002 |
| D R Tuition Ltd | Kelso | 2021 |
| D S M Training Ltd | Buckley | 2022 |
| D Salsbury Limited | Ashbourne | 2011 |
| D Stinson Education Limited | Barton-Upon-Humber | 2019 |
| D T Hughes Training Academy Ltd | Liverpool | 2020 |
| D Wanderer Limited | Manchester | 2018 |
| D Woodhouse Limited | Northwich | 2013 |
| D&A Driving Limited | Staines-Upon-Thames | 2023 |
| D&Ad | London | 1966 |
| D&Ad Trading Limited | London | 2004 |
| D&B Academy of Performing Arts Limited | Bromley | 2018 |
| D&B Productions CIC | Wolverhampton | 2026 |
| D&D Cricket Academy Ltd | Crawley | 2021 |
| D&D Education Limited | London | 2021 |
| D&D Training Limited | Sheerness | 2024 |
| D&G Education Services Ltd | London | 2020 |
| D&G First AID Training & Education Ltd | Dumbarton | 2025 |
| D&I Global Ltd | London | 2016 |
| D&J Driving Academy Limited | Dunmow | 2002 |
| D&J Recruits Ltd | London | 2024 |
| D&M Education Consultant Ltd | Manchester | 2026 |
| D&M Maguire Ltd | Newcastle | 2024 |
| D&M Young Solutions Ltd | London | 2014 |
| D&N Training Academy Ltd | Swindon | 2022 |
| D&R Tutoring Services CIC | Bromley | 2020 |
| D&Spg Limited | Bury St Edmunds | 2003 |
| D&U Consultancy Limited | Borehamwood | 2022 |
| D&Y Tutoring Services Ltd | Bury St. Edmunds | 2019 |
| D'Academy of Beauty Ltd | Enfield | 2021 |
| D'Loummmies CIC | Taunton | 2023 |
| D'Overbroeck's Limited | Eastleigh | 1980 |
| D'S Daycare Limited | Pontefract | 2014 |
| D'Silva Education Consultants Ltd | Brentwood | 2012 |
| D'Vanest Limited | Northampton | 2005 |
| D-Code Driving School Ltd | Coventry | 2014 |
| D-Dee’S Day Nursery Limited | Faversham | 2020 |
| D-Ways Ltd | Wirral | 2017 |
| D. & B. Training Limited | Newton-Le-Willows | 1989 |
| D. Edens Ltd | Hull | 2009 |
| D. Hughes Associates Limited | Wirral | 2015 |
| D. J. Bond & Associates Ltd. | London | 1995 |
| D.A. Psychology Ltd | Woodford Green | 2025 |
| D.A.B.Tuition Ltd | Bridgend | 2023 |
| D.A.F.C C.I.C. | Birmingham | 2026 |
| D.A.R.T Chesterfield Ltd | Chesterfield | 2013 |
| D.B.H. Consultancy Limited | Stockport | 2010 |
| D.E.M.I. Trust CIC | Birmingham | 2023 |
| D.ESCAL8 Limited | Clynderwen | 2013 |
| D.F.E. (UK) Limited | Wallington | 1998 |
| D.F.G Training Ltd | Harrow | 2020 |
| D.H. Training & Safety Solutions Limited | Coventry | 2011 |
| D.H.P Skyisthelimit Promotions Ltd | Birmingham | 2019 |
| D.N.I. Security Limited | London | 2005 |
| D.P. Education Limited | Bourne | 2006 |
| D.S.L.Training Ltd. | Bacup | 2017 |
| D.T.K. Business Services Limited | Stratford | 1994 |