Company Index - D
- D Gibson-Road & Quarry Services Ltd. - Glasgow
- D and S Fuel Installation Services Ltd - Malvern
- D C C Energy Ltd. - Belfast
- D H Scientific Ltd. - Huddersfield
- D N V Technica - Stockport
- D S B Offshore Ltd. - London
- Dainton Ltd - Ripon
- Dale UK Ltd - Scunthorpe
- Dales Pharmaceuticals - Skipton
- Danoil Lubricants Ltd. - Ossett
- Darch Oils - Yeovil
- Darenas - Swindon
- Darex U K Ltd. - St Neots
- Dartford Composites Ltd. - Erith
- Dasic International Ltd. - Romsey
- Datalase Ltd - Widnes
- David Carless - Newtownabbey
- Davis Schottlander & Davis Ltd - Letchworth
- Davy Process Technology - Stockton on Tees
- Dax Products Ltd. - Nottingham
- Deb Ltd. - Ripley
- Decorative Acrylic Co. Ltd. - Nottingham
- Dee-Anel Ltd. - Telford
- Deepdale Engineering Co Ltd - Dudley
- Deepwater EU Ltd - Canterbury
- Delta Energy Services - Coventry
- Delta Resins Ltd. - Stockport
- Deltaform Ltd. - Bridgwater
- Deltamoore Ltd - Attleborough
- Denehurst Chemical Safety Ltd. - Ilkley
- Denro - Shrewsbury
- Deritend Electromechanical Services Ltd - Birmingham
- Derrick Services (Uk) Ltd. - Great Yarmouth
- Designs on Beauty Ltd - Consett
- Destec Engineering Ltd - Lincoln
- Desurvey Plc - Ryde
- Detection Instruments (Northern) Ltd. - Kilmarnock
- Deutag Overseas (Curacao) Nv - Aberdeen
- Devine Chemicals - Consett
- Devon Gas - Barnstaple
- Diajet (Civil Engineering) Ltd - Bedford
- Diamond Offshore Ltd. - Aberdeen
- Diamould Ltd - Barrow in Furness
- Dinardo Partnership Ltd. - Paisley
- Dionex (U K) Ltd. - Camberley
- Direct Charcoal - Hope Valley
- Directa (U K ) Ltd. - Chelmsford
- Distillation Equipment Company Ltd - Stone
- Dixon Chew (Batley) Ltd. - Dewsbury
- Dixon Group Europe Ltd - Preston
- Dixon Marine Consulting Ltd. - Norwich
- Djb Labcare Ltd. - Newport Pagnell
- DKSH Great Britain Ltd - Wimbledon
- Doff Portland Ltd. - Nottingham
- Dolphin Drilling Ltd. - Aberdeen
- Don Heating Products (Division of Gazco) - Exeter
- Douglas Metal Finishing Ltd - London
- Dow Chemical Co - Middlesbrough
- Dow Haltermann Custom Processing - Middlesbrough
- Dowding and Mills Engineering Services Ltd - Ryton
- Down Hydraulics - Downpatrick
- Dpts Ltd. - Orpington
- Dragon Oil - London
- Drayton Tank and Accessories Ltd - Sheffield
- Dresser UK Ltd - Southampton
- Drilltec International Ltd. - Corby
- Druck Chemie U K Ltd. - Glasgow
- Dsm Nutritional Products (Uk) Ltd. - Heanor
- Du Pont (UK) Ltd - Stevenage
- Duco Ltd - Newcastle upon Tyne
- Dundee and Angus Oil Venture Group - Dundee
- Dunlop Oil & Marine Ltd. - Grimsby
- Durham Organics Ltd - Durham
- Durham Pipeline Technology Ltd. - Gateshead
- Duston Oils - Northampton
- DV Howells Ltd - Milford Haven
- Dwyfor Oils - Garndolbenmaen
- Dynamic Chemicals Ltd - Lanark
- Dynamic Group of Companies Ltd - Aberdeen
- Dynamic Load Monitoring (UK) Ltd - Southampton
- Dynex/Rivett Inc - St Neots