| CONTRONICS LIMITED | Computers, electronics and optics | 1978 | Audit-exempt subsidiary |
| KENTECH INSTRUMENTS LIMITED | Computers, electronics and optics | 1983 | Total exemption (full) |
| DELABIE UK LIMITED | Machinery and equipment | 1983 | Small company accounts |
| POLLUTION MONITORS LIMITED | Computers, electronics and optics | 1986 | Total exemption (full) |
| A.N. TECHNOLOGY LIMITED | Other manufacturing | 1987 | Total exemption (full) |
| CHILTERN CONNECTIONS LIMITED | Chemicals | 1990 | Total exemption (full) |
| PERFORMANCE ENCLOSURES LIMITED | Furniture | 1991 | Unaudited abridged |
| BEHIND CLOSED DOORS LIMITED | Repair and installation of machinery | 1994 | Total exemption (full) |
| BIZNIS CARDS LIMITED | Printing and recorded media | 2002 | Total exemption (full) |
| ARIANE SYSTEMS UK LIMITED | Repair and installation of machinery | 2005 | Small company accounts |
| EARTH SAVE PRODUCTS LIMITED | Other manufacturing | 2008 | Total exemption (full) |
| A. F. JONES STONEMASONS LIMITED | Glass, ceramics, cement and stone | 2009 | Total exemption (full) |