| Manufacturer | Sector | Year | Accounts type |
|---|---|---|---|
| CORNELIUS ELECTRONICS LIMITED | Computers, electronics and optics | 1983 | Medium company accounts |
| THE BRITISH ROTOTHERM COMPANY LIMITED | Computers, electronics and optics | 1990 | Medium company accounts |
| THERMAL ENGINEERING (WALES) LTD | Fabricated metal products | 1999 | Total exemption (full) |
| J.J. LEWIS GNOLL MONUMENTAL MASONS LTD | Glass, ceramics, cement and stone | 2003 | Unaudited abridged |
| LEO OPTICAL LIMITED | Other manufacturing | 2003 | Total exemption (full) |