Engineering Company Index - D
- D & R Structures Ltd. - Chichester
- D M M Engineering Ltd. - Caernarfon
- D & A Fabrications - Wigan
- D & A Services - Manchester
- D & B Darke Ltd. - Peterborough
- D & C Engineering - Bude
- D & C Transmissions - Greenford
- D & D Buckle - Stowmarket
- D & D Stainless Ltd. - Livingston
- D & E Metal Fabrications - Shipley
- D & E Precision Engineering - Walsall
D & H Engineering Ltd - Leicester- D & K Fabrications - Leicester
- D & M Engineering Ltd. - Farnham
- D & M Farm Services Ltd. - Londonderry
- D & M Plating Ltd. - Wolverhampton
- D & M Porter Ltd. - Penrith
- D & P Building & Joinery - Nottingham
- D & P Joinery Manufacturers - Nottingham
- D & Q Coin Equipment - Banbridge
- D & R Stainless Steel Products - Sheerness
- D & S Metalcraft - Chard
- D & S Precision Coatings Ltd. - Biggleswade
- D & T Mobility Services - Caerphilly
- D & W Metals - Stourbridge
- D 2 Food Systems Ltd. - Harpenden
- D A Cooper & Sons Ltd. - Rotherham
- D A B Engineering - Rotherham
- D A B Engineering Co. Ltd. - London
- D A C Steels Ltd. - Sheffield
- D A Culling Scrap Metals - Norwich
- D A French Precision Engineering - Bath
- D A Kettlewood - Selby
- D A S Engineering Services Ltd. - Castleford
- D A T Mechanical Services - Camberley
- D A T Tinstamp Ltd. - Dagenham
- D and B - Rotherham
- D and D (Fine Limits SMW) Ltd - Hampton
- D and D Engineering - Louth
- D and D Engineering (Hull) Ltd - Hull
- D and D International Valves Ltd - Bury St Edmunds
- D and E Architectural Hardware Ltd - Peterborough
- D and G Engineering - Weston super Mare
- D and G Fire Protection Ltd - Dumfries
- D and J (Steels) Ltd - Wolverhampton
- D and K Singer - Aberdeen
- D and L Blinds - Swindon
- D and M Powder Coatings - Batley
- D and M Towing - Sleaford
- D and P Services - Bootle
- D and T Precision Engineering Ltd - Southampton
- D B Broadcast Ltd. - Ely
- D B C Tools Ltd. - Letchworth
- D B Engineering Ltd. - Newport
- D B Engineering Services - Barry
- D B M G Ltd. - Cottingham
- D B R Associates Ltd. - Folkestone
- D B R A Ltd. - Bath
- D B S Brand Factors Ltd. - Warrington
- D B S Midlands Ltd. - Coventry
- D B Sheet Metal - Braintree
- D B Sheetmetals Ltd. - Haverhill
- D Barton Associates - Colchester
- D Beacock and Son - Scunthorpe
- D Blagbrough Engineering - Telford
- D Brash and Sons Ltd - Cardiff
- D C Hall Ltd. - Milton Keynes
- D C Woodhead & Partners Ltd. - Pudsey
- D C Associates - Manchester
- D C Car Repairs - Oxford
- D C Developments (Engineering) Ltd. - Norwich
- D C H Joinery - Hassocks
- D C M Drillquip Ltd. - Nuneaton
- D Camps - South Shields
- D Cumbley Fabrications - Hinckley
- D D C Engineering - Dalkeith
- D D S Polishing - Willenhall
- D D Signs & Blinds Manufacturers - London
- D D Z Marine Ltd. - Largs
- D E G Simpson & Sons - London
- D E W Electronic Eng Ltd. - Chigwell
- D G Engineering Co. Ltd. - St Helens
- D G Scott Ltd. - Alfreton
- D G Steel & Son Engineering Ltd. - Bury
- D G B Services - Scunthorpe
- D G Engineering Consultancy Ltd. - Bridgwater
- D G Pugh - Ilfracombe
- D G S (Grinding Wheels & Machines) Ltd. - Portsmouth
- D G S (Grinding Wheels & Machines) Ltd. - Wolverhampton
- D G Sheet Metal - Leeds
- D G Springs Ltd. - Leicester
- D H Autos - Newcastle
- D H B Machines (Brownhills) Ltd. - Walsall
- D H Bodycraft - Banbury
- D H F Engineering Ltd. - Melksham
- D H S Tool Supply Co. Ltd. - Plymouth
- D H Squire Consulting Engineers - Nottingham
- D Haynes Ltd. - Bolton
- D I Arnold and Son - Haverfordwest
- D I G (Holdings) Ltd. - Leiston
- D I S (East Anglia) Ltd. - Halstead
- D J Automation Engineering Ltd. - Shefford
- D J Mandley - Stockport
- D J McCarthy Associates Ltd. - Huddersfield
- D J Profile & Grinding Co. Ltd. - Stockport
- D J Sportscars International Ltd. - Harlow
- D J B Precision Engineering - Bedford
- D J Brown - St Albans
- D J Craddock & Sons - Redditch
- D J Enterprises - Hungerford
- D J F Metal Finishing - Birmingham
- D J Jasper (Steels) Ltd. - Rowley Regis
- D J M Developments Ltd. - Bacup
- D J N & Associates Ltd. - Wimborne
- D J P Consulting Engineers - Bristol
- D J Transmissions - Exeter
- D J Watts - Driffield