| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| B T G United Kingdom Ltd | 00839917 | 31/03/2001 | Dissolved |
| BROCK END RTM COMPANY LTD | 08808206 | 08/06/2018 | Gold |
| Bohlin Instruments Ltd | 03449973 | 22/12/2003 | Dissolved |
| CINTEX LIMITED | 01620109 | 02/02/2004 | Dissolved |
| CRICKLADE STREET RTM COMPANY LTD | 09915747 | 26/09/2018 | Not Trading |
| Cintex Group Ltd | 03191077 | 02/02/2004 | Dissolved |
| FAIREY FILTRATION LIMITED | 03532126 | 22/04/1998 | Dissolved |
| Fairey Microscan Ltd | 02974397 | 11/01/1995 | Dissolved |
| Imaging Technology Ltd | 02971257 | 29/03/1996 | Dissolved |
| Ircon Ltd | 00969709 | 01/05/1996 | Dissolved |
| LOCHARD (UK) LIMITED | 02769393 | 06/02/2009 | Dissolved |
| Loma Group Ltd | 01887871 | 19/04/1996 | Dissolved |
| NDC SYSTEMS LIMITED | 02625470 | 01/07/1997 | Dissolved |
| PARTICLE MEASURING SYSTEMS INC | FC022943 | 22/01/2001 | Dissolved |
| Particle Measuring Systems Europe Ltd | 02477046 | 12/02/1996 | Dissolved |
| SCIENTIFIC INSTRUMENT MAKERS HALL LIMITED | 01302882 | 20/10/2022 | Silver |
| SOUTHWICH HOUSE RTM COMPANY LTD | 09777116 | 26/09/2018 | Not Trading |
| SPECTRIS NCODE LIMITED | 01521027 | 01/12/2000 | Dissolved |
| Somat Systems (U.K.) Ltd | 02742332 | 31/07/2008 | Dissolved |
| Spectris (Uk) Ltd | 02724236 | 31/03/2001 | Dissolved |
| Spectris Technologies Ltd | 02381233 | 14/10/1997 | Dissolved |
| Spectrum Inspection Services Ltd | 03998781 | 19/06/2000 | Dissolved |
| VILLETS HOUSE RTM COMPANY LTD | 09903516 | 26/09/2018 | Not Trading |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| AGEMONT LIMITED | 03046375 | 30/09/2011 | 11/06/2014 | Dissolved |
| BRUEL & KJAER UK LIMITED | 04066051 | 10/10/2005 | 01/04/2014 | Gold |
| BRUEL & KJAER VTS LIMITED | 01539186 | 12/12/2008 | 01/04/2014 | Gold |
| BURNFIELD LIMITED | 01522736 | 24/01/1997 | 08/10/2013 | Silver |
| FAIREY INDUSTRIAL CERAMICS LIMITED | 01232580 | 20/09/1994 | 09/03/2002 | Bronze |
| Fairey Arlon Ltd | 00963414 | 29/03/1996 | 02/04/2001 | Dissolved |
| HOTTINGER BRUEL & KJAER UK LTD | 01589921 | 31/07/2008 | 24/03/2014 | Bronze |
| MALVERN PANALYTICAL LIMITED | 01020602 | 21/03/1997 | 24/03/2014 | Silver |
| MICROFILTREX LIMITED | 01179763 | 20/07/1994 | 26/03/2001 | Not Trading |
| NDC TECHNOLOGIES LIMITED | 00630998 | 18/11/1993 | 05/08/2003 | Silver |
| NEWPORT ELECTRONICS LIMITED | 01457039 | 30/09/2011 | 11/06/2014 | Not Trading |
| OMEGA ENGINEERING LIMITED | 02564017 | 30/09/2011 | 11/06/2014 | Silver |
| OMEGA TECHNOLOGIES LIMITED | 02775272 | 30/09/2011 | 11/06/2014 | Bronze |
| PANALYTICAL LIMITED | 01005071 | 19/02/1998 | 17/03/2014 | Not Trading |
| PARTICLE MEASURING SYSTEMS LIMITED | 00895810 | 21/01/2013 | 24/03/2014 | Dissolved |
| RAYCHEM LIMITED | 00674709 | 02/07/1993 | 03/09/1993 | Dissolved |
| RAYMARINE PLC | 04056987 | 16/01/2006 | 14/05/2010 | Dissolved |
| Ross Ceramics Stone Ltd | 01472331 | 24/12/1998 | 09/03/2002 | Dissolved |
| SERVOMEX GROUP LIMITED | 02170458 | 04/04/2001 | 10/10/2005 | Gold |
| SERVOMEX LIMITED | 01938746 | 25/05/2005 | 10/10/2005 | Dissolved |
| SPECTRIS FINANCE LIMITED | 03834606 | 22/12/2003 | 31/01/2008 | Dissolved |
| SPECTRIS GROUP HOLDINGS LIMITED | 01104312 | 25/05/2005 | 30/06/2014 | Silver |
| SPECTRIS PLC | 02025003 | 05/10/1993 | 30/06/2014 | Silver |
| SPECTRIS UK | 06493959 | 05/02/2008 | 11/06/2013 | Dissolved |
| SPECTRUM INSPECTION SYSTEMS | 00955630 | 08/09/1997 | 28/02/2007 | Dissolved |
| TELSPEC LIMITED | 02870908 | 27/10/2000 | 22/12/2003 | Dissolved |