| KYOCERA AVX COMPONENTS LIMITED | Frimley | 1975 | Full accounts |
| TERWIN INSTRUMENTS LIMITED | Bottesford | 1975 | Total exemption (full) |
| NIDEC CONTROL TECHNIQUES LIMITED | Powys | 1975 | Full accounts |
| ATOS IT SERVICES UK LIMITED | London | 1976 | Full accounts |
| PEAVEY ELECTRONICS LIMITED | Corby | 1976 | Total exemption (full) |
| MARPOSS LIMITED | Coventry | 1976 | Full accounts |
| KROHNE LIMITED | Wellingborough | 1976 | Full accounts |
| MCLENNAN SERVO SUPPLIES LIMITED | Ash Vale | 1976 | Total exemption (full) |
| CHARITY & TAYLOR (ELECTRONIC SERVICES) LIMITED | Great Yarmouth | 1976 | Small company accounts |
| GULMAY LIMITED | Byfleet | 1976 | Full accounts |
| JUBILEE ELECTRONICS LIMITED | Worksop | 1976 | Total exemption (full) |
| THALES DIS UK LIMITED | Reading | 1976 | Full accounts |
| ALBRIGHT INTERNATIONAL LIMITED | Whitchurch | 1976 | Full accounts |
| MCS CONTROL SYSTEMS LIMITED | Uxbridge | 1976 | Full accounts |
| RAYTEL GROUP LIMITED | South Woodham Ferrers | 1976 | Group accounts |
| RAYTEL SECURITY SYSTEMS LIMITED | South Woodham Ferrers | 1976 | Small company accounts |
| TRANSONICS LIMITED | Hemel Hempstead | 1976 | Full accounts |
| ROBYDOME PROPERTIES LIMITED | Ely | 1976 | Total exemption (full) |
| FORD ELECTRONICS LIMITED | Stafford | 1976 | Total exemption (full) |
| R. GORTON AND ASSOCIATES (ELECTRONICS) LIMITED | Reddish | 1976 | Total exemption (full) |
| ORMANTINE INTERNATIONAL LIMITED | Winchester | 1977 | Total exemption (full) |
| FGH CONTROLS LIMITED | Letchworth Garden City | 1977 | Small company accounts |
| SONARDYNE INTERNATIONAL LIMITED | Yateley | 1977 | Full accounts |
| DAU COMPONENTS LIMITED | Bognor Regis | 1977 | Total exemption (full) |
| MECMESIN LIMITED | Slinfold | 1977 | Audit-exempt subsidiary |
| PROMETHEAN LIMITED | Clitheroe | 1977 | Full accounts |
| ELECTRONIC TERMINATIONS LIMITED | Woodbridge | 1977 | Total exemption (full) |
| WENTWORTH LABORATORIES LIMITED | Bedfordshire | 1977 | Small company accounts |
| PNEUMAC (HADLEIGH) LIMITED | Hadleigh | 1977 | Total exemption (full) |
| PUPOSET LIMITED | Lancashire | 1977 | Total exemption (full) |
| RICHMOND RESEARCH LIMITED | Weymouth | 1977 | Total exemption (full) |
| BROADBRIDGE PRECISION ENGINEERING LIMITED | Crawley | 1977 | Total exemption (full) |
| RONAN ENGINEERING LIMITED | Sunderland | 1977 | Small company accounts |
| DREMIND LIMITED | Nottingham | 1977 | Total exemption (full) |
| CTDI GLENROTHES LIMITED | Wellingborough | 1977 | Full accounts |
| FLIR SYSTEMS LIMITED | West Malling | 1977 | Full accounts |
| HORIBA JOBIN YVON IBH LTD | Northampton | 1977 | Small company accounts |
| STATIC SYSTEMS GROUP LIMITED | Wolverhampton | 1977 | Full accounts |
| TUNSTALL HEALTHCARE (UK) LIMITED | Yorkshire | 1977 | Full accounts |
| OXFORD LASERS LIMITED | Oxford | 1977 | Full accounts |
| RADIODETECTION LIMITED | Bristol | 1977 | Full accounts |
| CORINTECH LIMITED | Fordingbridge | 1977 | Full accounts |
| WABTEC TRANSPORTATION SYSTEMS LIMITED | Altrincham | 1977 | Full accounts |
| EDWARDS MODULAR CONTROL LIMITED | Hove | 1977 | Total exemption (full) |
| SOUND LEISURE LIMITED | West Yorkshire | 1977 | Total exemption (full) |
| BEDESTONE LIMITED | Birmingham | 1977 | Total exemption (full) |
| GLENSOUND ELECTRONICS LIMITED | Maidstone | 1978 | Total exemption (full) |
| FLAIR ELECTRONIC SYSTEMS LIMITED | Hitchin | 1978 | Total exemption (full) |
| GAMTOL LIMITED | Leicester | 1978 | Total exemption (full) |
| FILTRONIC WIRELESS LTD | Sedgefield | 1978 | Full accounts |
| TECHTEST LIMITED | Leominster | 1978 | Full accounts |
| NORTEK ELECTRONIC CIRCUITS LIMITED | Congleton | 1978 | Total exemption (full) |
| PRACTICON LIMITED | Stoke on Trent | 1978 | Total exemption (full) |
| COMTREX SYSTEMS CORPORATION LIMITED | Abingdon | 1978 | Audit-exempt subsidiary |
| CMR CONTROLS LIMITED | Rochford | 1978 | Total exemption (full) |
| DATASTOR SYSTEMS LIMITED | Congleton | 1978 | Small company accounts |
| DIAMOND ELECTRONICS LIMITED | Smallwood Near Sandbach | 1978 | Full accounts |
| SWINDON SILICON SYSTEMS LIMITED | Swindon | 1978 | Audit-exempt subsidiary |
| CANFORD AUDIO LIMITED | Tyne and Wear | 1978 | Full accounts |
| COPLEY SCIENTIFIC LIMITED | Nottingham | 1978 | Full accounts |