| CHELSEA TECHNOLOGIES LTD | Other manufacturing | 1964 | Small company accounts |
| SONARDYNE INTERNATIONAL LIMITED | Computers, electronics and optics | 1977 | Full accounts |
| INTERPOINT (UK) LIMITED | Computers, electronics and optics | 1988 | Full accounts |
| ATLANTIC PRECISION ENGINEERING LIMITED | Rubber and plastics | 1989 | Audit-exempt subsidiary |
| ABUS CRANE SYSTEMS LIMITED | Machinery and equipment | 1991 | Small company accounts |
| SONARDYNE OVERSEAS HOLDINGS LIMITED | Computers, electronics and optics | 1999 | Small company accounts |
| HYDRATEC LIFT SERVICES LIMITED | Repair and installation of machinery | 1999 | Unaudited abridged |
| YES PRINT LIMITED | Printing and recorded media | 2003 | Total exemption (full) |