| RAYLEIGH INSTRUMENTS LIMITED | Computers, electronics and optics | 1964 | Full accounts |
| RAYTEL GROUP LIMITED | Computers, electronics and optics | 1976 | Group accounts |
| RAYTEL SECURITY SYSTEMS LIMITED | Computers, electronics and optics | 1976 | Small company accounts |
| NSM SPECIAL PRODUCTS UK LIMITED | Fabricated metal products | 1991 | Total exemption (full) |
| SMITH'S ENVIRONMENTAL PRODUCTS LIMITED | Fabricated metal products | 1991 | Full accounts |
| RJM SERVICES LIMITED | Rubber and plastics | 1999 | Total exemption (full) |
| SHAKESPEARE ENGINEERING INTERNATIONAL (ASIA) LIMITED | Basic metals | 2009 | Group accounts |