| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| 12 LINDFIELD GARDENS (MANAGEMENT) LTD | 03658140 | 28/10/1998 | Silver |
| AFI INVESTMENTS | 03713691 | 01/06/2005 | Dissolved |
| BARTERSTORE | 03452692 | 01/06/2005 | Dissolved |
| BETTER STATISTICS CIC | 13219463 | 23/02/2021 | One Red Flag |
| Bdi Research Ltd | 02079055 | 29/01/2002 | Dissolved |
| Bem Ltd | 03061489 | 29/01/2002 | Dissolved |
| DEALTALK LIMITED | 05356725 | 01/06/2005 | Dissolved |
| GFK MARTIN HAMBLIN LIMITED | 00905143 | 01/10/2005 | Dissolved |
| Ggc-Nop Ltd | 03403987 | 29/01/2002 | Dissolved |
| INTERACTIVE RESEARCH LIMITED | 01792625 | 22/12/2004 | Dissolved |
| MIL RESEARCH GROUP LIMITED | 00471008 | 02/11/1992 | Dissolved |
| Mediametrics Ltd | 02764699 | 29/01/2002 | Dissolved |
| NATIONAL CENTRE FOR SOCIAL RESEARCH | 04392418 | 01/11/2019 | Silver |
| NATIONAL OPINION POLLS LIMITED | 03710501 | 01/06/2005 | Dissolved |
| NOP WORLD LIMITED | 02379453 | 01/06/2005 | Dissolved |
| Nop Consumer Market Research Ltd | 01792623 | 29/01/2002 | Dissolved |
| Nop Market Research Ltd | 00801975 | 29/01/2002 | Dissolved |
| Nop Mystery Shopping Ltd | 01792624 | 29/01/2002 | Dissolved |
| Nop Surveymaster Ltd | 03849252 | 29/01/2002 | Dissolved |
| Nopw Ltd | 03718823 | 01/06/2005 | Dissolved |
| Numbers Data Processing Ltd | 02375599 | 29/01/2002 | Dissolved |
| Numbers Market Research Ltd | 01992719 | 29/01/2002 | Dissolved |
| Radio Research Ltd | 01802150 | 29/01/2002 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| Berry Phillips & Doyle Ltd | 02599052 | 23/08/1996 | 05/02/1999 | Dissolved |
| FLACKETT, STEVENS AND ASSOCIATES LIMITED | 02350085 | 22/12/2004 | 23/11/2005 | Dissolved |
| GFK FIELD INTERVIEWING SERVICES UK LIMITED | 03105571 | 29/01/2002 | 01/12/2013 | Dissolved |
| GFK SHARED SERVICES UK LIMITED | 03190837 | 29/01/2002 | 01/12/2013 | Dissolved |
| GFK TELEPHONE INTERVIEWING SERVICES UK LIMITED | 03180166 | 29/01/2002 | 01/12/2013 | Dissolved |
| GFK U.K. LIMITED | 02512551 | 02/11/1992 | 01/02/2013 | Silver |
| Gfk Great Britain Ltd | 01546385 | 17/10/2005 | 17/10/2005 | Dissolved |
| IPSOS MYSTERY SHOPPING SERVICES UK LIMITED | 03190828 | 29/01/2002 | 01/12/2013 | Dissolved |
| IPSOS MYSTERY SHOPPING UK LIMITED | 05895847 | 03/08/2006 | 01/12/2013 | Dissolved |
| MARKET RESEARCH SOCIETY(THE) | 00518685 | 01/04/2012 | 31/03/2014 | Silver |
| NUMBERS SERVICES LIMITED | 01986188 | 29/01/2002 | 01/12/2013 | Dissolved |
| Research Direct Ltd | 03153276 | 03/07/1996 | 03/07/1998 | Dissolved |
| SPARK FIELD SOLUTIONS LIMITED | 01425948 | 29/01/2002 | 22/01/2004 | Dissolved |