| SOLID SWIVEL COMPANY LIMITED(THE) | West Midlands | 1950 | Total exemption (full) |
| ASTELL SCIENTIFIC LIMITED | Kent | 1950 | Total exemption (full) |
| BAVENHILL MECHANICS COMPANY LIMITED | Herefordshire | 1950 | Total exemption (full) |
| ALLAN FULLER LIMITED | Chepstow | 1951 | Total exemption (full) |
| TORQUEMETERS LIMITED | Northampton | 1951 | Full accounts |
| WILLIAM B. SWIFT LIMITED | Huddersfield | 1951 | Small company accounts |
| A.J.T. EQUIPMENT LIMITED | Brierley Hill | 1951 | Total exemption (full) |
| VOLLMER UK LIMITED | Town Street Sandiacre Nottingham | 1952 | Small company accounts |
| POWELL MANUFACTURING CO. (COVENTRY) LIMITED | Coventry | 1952 | Total exemption (full) |
| ALVAN BLANCH DEVELOPMENT COMPANY LIMITED | Malmesbury | 1952 | Medium company accounts |
| SPIRAX-SARCO LIMITED | Cheltenham | 1952 | Full accounts |
| AGCO LIMITED | Kenilworth | 1952 | Full accounts |
| WRW ENGINEERING COMPANY LIMITED | Hersham | 1953 | Total exemption (full) |
| CRAFTSMAN TOOLS LIMITED | Otley | 1953 | Total exemption (full) |
| ESSEX COIN-OP CONTROL LIMITED | London | 1953 | Total exemption (full) |
| KAS PAPER SYSTEMS LIMITED | Bedfordshire | 1953 | Total exemption (full) |
| KRONES UK LIMITED | West Houghton | 1953 | Full accounts |
| GOODRICK GEAR COMPANY LIMITED | Borth | 1953 | Total exemption (full) |
| MICRON SPRAYERS LIMITED | Bromyard | 1954 | Small company accounts |
| MILLROOM MIXING MACHINES LIMITED | Newtown | 1954 | Total exemption (full) |
| TOMLINSON,HALL & COMPANY LIMITED | Billingham | 1954 | Total exemption (full) |
| SPRINGCO (N.I.) LIMITED | Portadown | 1954 | Total exemption (full) |
| TRACTEL (UK) LIMITED | Sheffield | 1954 | Full accounts |
| TELEKTRON LIMITED | London | 1954 | Total exemption (full) |
| GURNEY REEVE & CO.LIMITED | Wymondham | 1954 | Total exemption (full) |
| VELAN VALVES LIMITED | London | 1954 | Full accounts |
| LAPMASTER WOLTERS LIMITED | Ivybridge | 1954 | Small company accounts |
| A B GRAPHIC INTERNATIONAL LIMITED | Staffordshire | 1954 | Full accounts |
| SMS MEVAC UK LIMITED | Northwich | 1954 | Small company accounts |
| KEE PROCESS LIMITED | Aylesbury | 1955 | Small company accounts |
| HART DOOR SYSTEMS LIMITED | Tyne and Wear | 1955 | Small company accounts |
| PERRY OF OAKLEY LIMITED | Honiton | 1955 | Small company accounts |
| ESSEX ENGINEERING WORKS (WANSTEAD) LIMITED | London | 1955 | Total exemption (full) |
| HAIGH ENGINEERING CO,LIMITED(THE) | Herefordshire | 1955 | Medium company accounts |
| FREDERICK CROWTHER & SON LIMITED | Brighouse | 1955 | Total exemption (full) |
| ROBERT C.SCUTT LIMITED | Ipswich | 1955 | Total exemption (full) |
| SCHAEFFLER (UK) LIMITED | Birmingham | 1955 | Full accounts |
| FREDSHAW & CO LIMITED | Huddersfield | 1955 | Total exemption (full) |
| NIC INSTRUMENTS LIMITED | Kent | 1955 | Total exemption (full) |
| ORTHOS (ENGINEERING) LIMITED | Leicestershire | 1956 | Total exemption (full) |
| VALLEY HYDRAULICS LIMITED | Chatburn | 1956 | Total exemption (full) |
| J.C. BAMFORD EXCAVATORS LIMITED | Uttoxeter | 1956 | Group accounts |
| KRATOS ANALYTICAL LIMITED | Manchester | 1956 | Full accounts |
| J.C.B. SERVICE | Uttoxeter, Staffs | 1956 | Group accounts |
| LUTON JIG AND TOOL COMPANY LIMITED(THE) | Luton | 1956 | Total exemption (full) |
| DOITY ENGINEERING LIMITED | Rochdale | 1956 | Total exemption (full) |
| OILGEAR TOWLER LIMITED | Leeds | 1956 | Small company accounts |
| DOSCO OVERSEAS ENGINEERING LIMITED | Liverpool | 1956 | Full accounts |
| BOLLIN DALE ENGINEERING LIMITED | Macclesfield | 1956 | Total exemption (full) |
| STANBRIDGE LIMITED | Dartford | 1956 | Total exemption (full) |
| MACART TEXTILES(MACHINERY)LIMITED | Bradford | 1956 | Total exemption (full) |
| CUMMINS LTD. | London | 1956 | Full accounts |
| MEREDITH AND EYRE LIMITED | Hyde | 1956 | Total exemption (full) |
| XEROX LIMITED | Uxbridge | 1956 | Full accounts |
| CHARLES AUSTEN PUMPS LIMITED | Weybridge | 1957 | Medium company accounts |
| M.SEDGWICK & COMPANY LIMITED | Leeds | 1957 | Total exemption (full) |
| BRIGGS BROS. (ENGINEERS) LIMITED | Redditch | 1957 | Total exemption (full) |
| J. FILBY LIMITED | West Midlands | 1957 | Total exemption (full) |
| TROUT TOOL CO,LIMITED | Camberley | 1957 | Total exemption (full) |
| AUTOSCAN LIMITED | Edinburgh | 1957 | Unaudited abridged |