| WAGSTAFF FOUNDRIES LIMITED | London | 1956 | Total exemption (full) |
| T. & T. TUBECRAFT LIMITED | Farnham | 1956 | Total exemption (full) |
| P W S IRELAND LIMITED | Newry | 1956 | Total exemption (full) |
| ISAAC H. GRAINGER & SON LIMITED | West Midlands | 1956 | Total exemption (full) |
| H. DOWNS & SONS (HUDDERSFIELD) LIMITED | Huddersfield | 1957 | Small company accounts |
| MAGNETIC SHIELDS LIMITED | Staplehurst | 1957 | Medium company accounts |
| COLESHILL ALUMINIUM LIMITED | Birmingham | 1957 | Full accounts |
| GEORGE GRIFFITHS (SPRINGS) LIMITED | West Bromwich | 1957 | Total exemption (full) |
| ALANOD LIMITED | Aylesbury | 1957 | Small company accounts |
| DARWINS HOLDINGS LIMITED | Cardiff | 1957 | Full accounts |
| GOODWIN STEEL CASTINGS LIMITED | Stoke-on-Trent | 1958 | Full accounts |
| HY-TEN LIMITED | Surrey | 1958 | Medium company accounts |
| A.D.HALL LIMITED | Stoke on Trent | 1958 | Small company accounts |
| CANLIN CASTINGS LIMITED | Nottingham | 1958 | Total exemption (full) |
| J.T. & E. CASTINGS LIMITED | Wigan | 1959 | Total exemption (full) |
| ARCONIC MANUFACTURING (GB) LIMITED | Birmingham | 1959 | Full accounts |
| QUALITY CASTINGS(SLOUGH)LIMITED | Bury St. Edmunds | 1959 | Total exemption (full) |
| ARCHIBALD YOUNG LIMITED | Glasgow | 1959 | Small company accounts |
| FLOUCH ENGINEERING CO. LIMITED | Sheffield | 1960 | Total exemption (full) |
| PITCHFORD STEELSTOCK LIMITED | Brierley Hill | 1960 | Total exemption (full) |
| DAFTEN DIE-CASTING LIMITED | Wadebridge | 1960 | Total exemption (full) |
| R.M. EASDALE & COMPANY LIMITED | Glasgow | 1960 | Group accounts |
| BROOKS, CROWNHILL PATTERNMAKERS LIMITED | Andover | 1962 | Total exemption (full) |
| WESTLANDS CASTING CO LIMITED | Wellingborough | 1962 | Total exemption (full) |
| PRECISION CASTING LIMITED | St. Austell | 1962 | Small company accounts |
| THURTON FOUNDRIES LIMITED | Norfolk | 1963 | Total exemption (full) |
| SIGMA PRECISION COMPONENTS UK LIMITED | Hinckley | 1963 | Full accounts |
| TI GROUP AUTOMOTIVE SYSTEMS (UK) LIMITED | Oxford | 1963 | Audit-exempt subsidiary |
| WALL COLMONOY LIMITED | Pontardawe | 1964 | Full accounts |
| W. & J. SMITH (METAL STOCKISTS) LIMITED | West Midlands | 1964 | Total exemption (full) |
| C.& S.STEELS(WOLVERHAMPTON)LIMITED | Bilston | 1964 | Full accounts |
| BATLEY FOUNDRY LIMITED | North Lincolnshire | 1964 | Total exemption (full) |
| JAYBEE ENGINEERING COMPANY(BRIGHTON)LIMITED | Newhaven | 1964 | Total exemption (full) |
| J & R HILL LIMITED | Stoke on Trent | 1964 | Total exemption (full) |
| CRONITE CASTINGS LIMITED | Somerset | 1964 | Full accounts |
| HARMON (FORM TOOLS) LIMITED | — | 1964 | Group accounts |
| R&G FLUID POWER GROUP (HYDRAULICS DIVISION) LIMITED | London | 1964 | Audit-exempt subsidiary |
| DRAYCAST FOUNDRIES LIMITED | Bucks | 1964 | Total exemption (full) |
| TURNER & WILSON LIMITED | Tonbridge | 1964 | Total exemption (full) |
| HADLEY INDUSTRIES HOLDINGS LIMITED | Smethwick | 1964 | Full accounts |
| EASIFLO FABRICATIONS LIMITED | Brierley Hill | 1965 | Small company accounts |
| MIDLAND CARBIDES LIMITED | Ashby-de-la-Zouch | 1965 | Total exemption (full) |
| R.E.B. WELDING LIMITED | Grays Essex | 1966 | Total exemption (full) |
| R J W SHEET METAL LIMITED | Staphill Wimborne | 1966 | Total exemption (full) |
| SKAIGH ENGINEERING CO.LIMITED | Newton Abbot Devon | 1966 | Total exemption (full) |
| PRIORY WOODFIELD ENGINEERING LIMITED | Wolverhampton | 1966 | Total exemption (full) |
| COPELAND & CRADDOCK LIMITED | Newcastle | 1966 | Small company accounts |
| TERRILL BROS. (FOUNDERS) LIMITED | Hayle | 1966 | Total exemption (full) |
| GRAVESEND ENGINEERING CO. LIMITED | Gravesend | 1966 | Total exemption (full) |
| JONIC ENGINEERING LIMITED | Birmingham | 1966 | Total exemption (full) |
| BRAFE ENGINEERING LIMITED | Suffolk | 1966 | Full accounts |
| BERRYS TECHNOLOGIES LIMITED | Birmingham | 1966 | Total exemption (full) |
| R.M. EASDALE AND COMPANY (LEAD) LIMITED | Glasgow | 1966 | Total exemption (full) |
| HAWORTH CASTINGS LIMITED | Devon | 1967 | Small company accounts |
| LARANCA ENGINEERING LIMITED | Earlswood, Solihull | 1967 | Total exemption (full) |
| FORT VALE ENGINEERING LIMITED | Burnley | 1967 | Full accounts |
| H.V. WOODING LIMITED | Hythe | 1967 | Full accounts |
| HOGANAS (GREAT BRITAIN) LIMITED | Tonbridge | 1968 | Full accounts |
| MARFLOW ENGINEERING LIMITED | Great Dunmow | 1968 | Small company accounts |
| PEEL JONES COPPER PRODUCTS LIMITED | Saltburn by Sea | 1968 | Total exemption (full) |