| P G PRODUCTS LTD. | Clothing | 1969 | Total exemption (full) |
| ROWLANDS-WOODHOUSE EQUIPMENT LIMITED | Machinery and equipment | 1977 | Total exemption (full) |
| ASHFORD COMMERCIAL LIMITED | Rubber and plastics | 1985 | Total exemption (full) |
| LAPLACE INSTRUMENTS LIMITED | Computers, electronics and optics | 1988 | Total exemption (full) |
| ROWLANDS WOODHOUSE (HOLDINGS) LIMITED | Machinery and equipment | 2002 | Total exemption (full) |
| HAVSCO LIMITED | Computers, electronics and optics | 2005 | Total exemption (full) |
| ISOTOPE PRECISION LIMITED | Computers, electronics and optics | 2006 | Total exemption (full) |
| CLEDOP UK LIMITED | Chemicals | 2007 | Total exemption (full) |
| IAN BAIRD WELDING REPAIRS LIMITED | Repair and installation of machinery | 2008 | Total exemption (full) |
| STRANGE FARM LIMITED | Textiles | 2010 | Total exemption (full) |
| INSTROMET WEATHER SYSTEMS LIMITED | Computers, electronics and optics | 2010 | Total exemption (full) |