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

Diverse Technologies & Systems Ltd

DLI Engineering Ltd

Don Controls Ltd

Don Electronics Ltd

Doug Booth UK Ltd

Dragon Circuits

DriveWorks Ltd

DSG - Defence Support Group

Dunne Roberts Ltd

Durr Ltd

Dutton Engineering Woodside Ltd

E3design

Eadon Consulting Ltd

ECM Electronics Ltd

Edgefine Engineering Ltd

EDS Engineering Ltd