Data Engineering (Hoddesdon) Ltd

Datalink Electronics Ltd

Dataracks

Datum Electronics Ltd

Dau Components Ltd

Davall Gears

David Munns Consulting

DC Allen Ltd

DCA Design International Ltd

Delfield Precision Engineering Co Ltd

Delkia Ltd

Delta Microelectronics

Denis Ferranti Meters Ltd

Design Interface Ltd

Desman Engineering Ltd

Deva Electronic Controls Ltd

Di-Spark Ltd

Diamond Point International

Dictator Engineering Ltd

Digi-Key Electronics

Digitimer Ltd

Display Technology Ltd

Diverse Technologies & Systems Ltd

DLI Engineering Ltd

Don Controls Ltd

Don Electronics Ltd

Doug Booth UK Ltd

Douglas Corporation

Dragon Circuits

Draycote Technology Ltd

Drive System Design Ltd

DriveWorks Ltd

DSG - Defence Support Group

Dunne Roberts Ltd

Durr Ltd

Dutton Engineering Woodside Ltd

Dutton Simulation Ltd

Dynamic EMS Ltd

E&S Environmental Services Ltd

E3design

Eadon Consulting Ltd

Eaton Crouse-Hinds

ECM Electronics Ltd

Ecomal UK Ltd

Eddingbrook Ltd

Edgefine Engineering Ltd

EDS Engineering Ltd

EJ Watts Pipework Ltd

ELC Ltd

Electrix International Ltd