Company Index
- D S C Fuels - Bishop Auckland
- Dacoma Ltd - Redditch
- Dainton Ltd - Ripon
- Dalau Ltd - Clacton on Sea
- Dale (Mansfield) Ltd - Mansfield
- Dale UK Ltd - Scunthorpe
- Dales Pharmaceuticals Ltd - Skipton
- Daltrade plc - Goole
- Dampa (UK) Ltd - Wallingford
- Danoil Lubricants Ltd - Ossett
- Darch Oils - Yeovil
- Darex UK Ltd - St Neots
- Dartford Composites Ltd - Erith
- Dasic International Ltd - Romsey
- Dataco - Aberdeen
- Datalink Electronics Ltd - Loughborough
- David Carless - Newtownabbey
- Davis Schottlander and Davis Ltd - Letchworth
- Davy Process Technology - Stockton on Tees
- Davy Process Technoloy - London
- Dawson Downie Lamont Ltd - Glenrothes
- Dawsonrentals Portable Cold Storage Ltd - Sutton in Ashfield
- Dax Products - Nottingham
- DCG (Consulting Engineers) Ltd - Basildon
- DDD Group Ltd - Watford
- DDL Pattern Shop - Glenrothes
- De Gussa Construction Chemicals - Redditch
- De Neef UK Ltd - Birkenhead
- Deb Ltd - Belper
- Decorative Acrylic Co Ltd - Kirkby in Ashfield
- Dee-Anel - Telford
- Deepdale Engineering Co Ltd - Dudley
- Degussa Construction Chemicals - Manchester
- Degussa Ltd - Macclesfield
- Delimon Cooling / Delimon Denco Lubrication - Hereford
- Delta Petroleum - Lincoln
- Delta Resin Products Ltd - Stockport
- Delta Technology - Darlington
- Deltaform Ltd - Bridgwater
- Deltamoore Ltd - Attleborough
- Denehurst Chemical Safety Ltd - Ilkley
- Denro - Shrewsbury
- Derbyshire Mining Ltd - Chesterfield
- Deritend Electromechanical Services Ltd - Birmingham
- Derrick Services Ltd - Great Yarmouth
- Derwent Water Systems Ltd - Matlock
- Design Research and Development Co Ltd - Billingham
- Destec Engineering Ltd - Lincoln
- Desurvey plc - Birkenhead
- Desurvey plc - St Helens
- Detection Instruments (Northern) Ltd - Kilmarnock
- Deutag Overseas (Curacao) NV - Aberdeen
- Devine Chemicals - Consett
- Devon Gas - Barnstaple
- Dezac Group Ltd - Cheltenham
- DH Scientific - Huddersfield
- Diamond Offshore (UK) Ltd - Aberdeen
- Diamould Ltd - Barrow in Furness
- Diaphragm Pumps Ltd - Stoke on Trent
- DIC Europe GmbH UK Branch - Feltham
- Dickies (UK) Ltd - Bath
- Dinardo Partnership - Paisley
- Dionex (UK) Ltd - Camberley
- Dipetane Distribution - Fakenham
- Direct Charcoal - Hope Valley
- Directa UK Ltd - Chelmsford
- Distillation Alliance Ltd - Kingswinford
- Distillation Equipment Company Ltd - Stone
- Dixon Chew Batley Ltd - Dewsbury
- Dixon Marine Consulting Ltd - Norwich
- DJB Labcare Ltd - Newport Pagnell
- DKSH Great Britain Ltd - Wimbledon
- DM Wood Medical Ltd - Aberdeen
- DMA Water Treatment Ltd - Motherwell
- DMV UK - Consett
- DNO Heather Ltd - Aberdeen
- DNV Ltd - Stockport
- Doff Portland Ltd - Nottingham
- Dolphin Drilling Ltd - Aberdeen
- Dolphin Environment Services Ltd - Redditch
- Domnick Hunter - Chester le Street
- Don Heating Products (Division of Gazco) - Exeter
- Doncasters Paralloy - Billingham
- Dorking Advanced Cladding Ltd - Horsham
- Dorr-Oliver Eimco UK - Rugby
- Douglas Plating Ltd - London
- Douglas Rutter and Associates - Abergavenny
- Dow Chemical Co Ltd - Middlesbrough
- Dow Chemical Co Ltd - West Drayton
- Dow Corning Analytical Solutions - Barry
- Dowding and Mills Engineering Services Ltd - Ryton
- Down Hydraulics - Downpatrick
- DPTS Ltd - Orpington
- Dragon Oil plc - London
- Drayton Tank and Accessories Ltd - Sheffield
- Dresser UK Ltd - Southampton
- Dresser Valve Division Ltd - Uxbridge
- Drilltec International Ltd - Corby
- Druke Ehemi (UK) Ltd - Cumbernauld
- Dry Hale Systems Ltd - Manchester
- Dry Ice - Yara (formerly Hydrogas) - Hounslow
- DSB Offshore Ltd - London
- DSM Nutritional Products - Heanor
- Du Pont (UK) Ltd - Stevenage
- Duco Ltd - Newcastle upon Tyne
- Dundee and Angus Oil Venture Group - Dundee
- Dunlop Oil and Marine Ltd - Grimsby
- Duratank - Southampton
- Durham Organics Ltd - Durham
- Durham Pipeline Technology - Gateshead
- Durr Technik (UK) Ltd - Bristol
- Duston Oils - Northampton
- DV Howells Ltd - Milford Haven
- Dwyfor Oils - Garndolbenmaen
- Dynamic Chemicals Ltd - Lanark
- Dynamic Group of Companies Ltd - Aberdeen
- Dynamic Positioning Centre The - London
- Dynamic Positioning Services Ltd - Aberdeen
- Dynamic-Ceramic Ltd - Crewe
- Dynamics - Chelmsford
- Dynant Fach Colliery Co Ltd - Llanelli
- Dynex Rivett Inc - St Neots
