| PYRONIX LIMITED | Rotherham | 1986 | Full accounts |
| JAUCH QUARTZ U.K. (COMPONENTS DIVISION) LTD | Frimley | 1986 | Small company accounts |
| VOLTECH INSTRUMENTS LIMITED | Blackburn | 1986 | Total exemption (full) |
| CAMDEN BOSS LIMITED | Ipswich | 1986 | Medium company accounts |
| CORNERSTONE SYSTEMS LTD. | Staffordshire | 1986 | Total exemption (full) |
| SELECTRONIX ONBOARD LIMITED | Reading | 1986 | Total exemption (full) |
| MINSTERPORT LIMITED | Barnetby | 1986 | Small company accounts |
| TANSUN LIMITED | Dudley | 1986 | Total exemption (full) |
| MILDEF UK LTD | Melksham | 1986 | Medium company accounts |
| CUSTOM INTERCONNECT LIMITED | Andover | 1986 | Full accounts |
| CDK SYSTEMS LIMITED | Congleton | 1986 | Total exemption (full) |
| TOPLINE ELECTRONICS LIMITED | Hailsham | 1986 | Medium company accounts |
| CAMBRIDGE CIRCUIT COMPANY LIMITED | Cambridge | 1986 | Total exemption (full) |
| HI-REL LIDS LIMITED | Harleston | 1986 | Full accounts |
| OSI ELECTRONICS (UK) LTD | London | 1986 | Medium company accounts |
| SEMEFAB LIMITED | Glenrothes | 1986 | Full accounts |
| YOKOGAWA UNITED KINGDOM LIMITED | Runcorn | 1986 | Full accounts |
| PEAK AUTOMATION SYSTEMS LIMITED | London | 1986 | Total exemption (full) |
| TECHPOINT FAST TRACK SOLUTIONS LIMITED | Basingstoke | 1986 | Small company accounts |
| MONITRAN LIMITED | Penn | 1986 | Total exemption (full) |
| A & P CHAMBERS LIMITED | Inverness | 1986 | Total exemption (full) |
| L.C.M. SYSTEMS LIMITED | Newport | 1986 | Small company accounts |
| ROBERTSON GEOLOGGING LIMITED | Conwy | 1986 | Group accounts |
| BASSETT ELECTRONIC SYSTEMS LIMITED | Swindon | 1986 | Total exemption (full) |
| GAUGE DEVELOPMENTS GROUP LIMITED | Ashton-under-Lyne | 1986 | Total exemption (full) |
| SHIELD SIGHTS LTD | Bournemouth | 1986 | Total exemption (full) |
| DATA CONVERSION SYSTEMS LIMITED | Cambridge | 1986 | Total exemption (full) |
| HYDRAMOTION LIMITED | Malton | 1986 | Total exemption (full) |
| TOSOH BIOSCIENCE LIMITED | London | 1986 | Full accounts |
| STERLING ITI LTD | Oldham | 1986 | Total exemption (full) |
| AMFAX LIMITED | Blandford Forum | 1986 | Total exemption (full) |
| BROCKHILL ENTERPRISES LIMITED | Kirkby Stephen | 1986 | Total exemption (full) |
| EPSON TELFORD LIMITED | Shropshire | 1987 | Full accounts |
| QUARTZ TECHNICAL SERVICES LIMITED | Leicestershire | 1987 | Total exemption (full) |
| KNOWLES (UK) LIMITED | Norwich | 1987 | Medium company accounts |
| AMPETRONIC LIMITED | Newark | 1987 | Small company accounts |
| TECHNICAL SERVICES AND SUPPLIES LIMITED | York | 1987 | Unaudited abridged |
| NEWPORT SPECTRA-PHYSICS LIMITED | Crewe | 1987 | Full accounts |
| APPLIED KILOVOLTS LIMITED | Worthing | 1987 | Audit-exempt subsidiary |
| WESTFIELD DISTRIBUTION LIMITED | Hungerford | 1987 | Total exemption (full) |
| TERRATRIP (UK) LIMITED | Derby | 1987 | Total exemption (full) |
| COEVAL LIMITED | Glasgow | 1987 | Total exemption (full) |
| CAMBRIDGE ELECTRONIC INDUSTRIES LIMITED | Cambridge | 1987 | Total exemption (full) |
| BGB ENGINEERING LIMITED | Lincolnshire | 1987 | Full accounts |
| IQE (EUROPE) LIMITED | Cardiff | 1987 | Audit-exempt subsidiary |
| JAYTEE BIOSCIENCES LIMITED | Herne Bay | 1987 | Total exemption (full) |
| OVATION SYSTEMS LIMITED | Thame | 1987 | Small company accounts |
| PCS INSTRUMENTS LIMITED | London | 1987 | Full accounts |
| MUTECH LIMITED | Irlam | 1987 | Total exemption (full) |
| CLOOS (UK) LIMITED | Cannock | 1987 | Small company accounts |
| MKS SPECTRA HOLDINGS LIMITED | Crewe | 1987 | Full accounts |
| BLACKBURN STARLING & COMPANY LIMITED | — | 1987 | Audit-exempt subsidiary |
| BEADLIGHT LIMITED | Oxfordshire | 1987 | Total exemption (full) |
| ASTEELFLASH (BEDFORD) LIMITED | Bedford | 1987 | Full accounts |
| POWERSOLVE ELECTRONICS LIMITED | Newbury | 1987 | Total exemption (full) |
| TELEPLAN FORSBERG LIMITED | Aberdeen | 1987 | Medium company accounts |
| BAILEY & MACKEY LIMITED | — | 1987 | Total exemption (full) |
| KELVINSIDE ELECTRONICS LIMITED | Strathclyde | 1987 | Full accounts |
| AVALON SCIENCES LIMITED | Somerton | 1987 | Group accounts |
| SCANNA MSC LIMITED | London | 1987 | Audited abridged |