| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Malary Environmental Services Ltd | 03445467 | 02/07/2008 | Dissolved |
| Safety Micron Systems U.K. Ltd | 01782348 | 02/07/2008 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| SAFETY-KLEEN EUROPE LIMITED | 03686221 | 02/07/2008 | 23/07/2015 | One Red Flag |
| SAFETY-KLEEN U.K. LIMITED | 01190039 | 02/07/2008 | 23/07/2015 | Bronze |
| SAFETY-KLEEN UK (EUROPE) LIMITED | 03673963 | 02/07/2008 | 23/07/2015 | Bronze |
| SAFETY-KLEEN UK (FRANCE) LIMITED | 03673966 | 02/07/2008 | 23/07/2015 | Amber |
| SAFETYKLEEN FINANCE LIMITED | 06590913 | 24/06/2008 | 23/07/2015 | Amber |
| SAFETYKLEEN GROUP SERVICES LIMITED | 06544285 | 18/06/2008 | 23/07/2015 | One Red Flag |
| WP MIDCO1 LIMITED | 06544559 | 18/06/2008 | 23/07/2015 | One Red Flag |
| WP MIDCO2 LIMITED | 06544394 | 18/06/2008 | 23/07/2015 | Silver |
| WP MIDCO3 LIMITED | 06544475 | 18/06/2008 | 23/07/2015 | Silver |
| WP SAFETY-KLEEN LIMITED | 06544225 | 18/06/2008 | 23/07/2015 | Silver |
| WP SK FRANCE LIMITED | 05134646 | 02/07/2008 | 23/07/2015 | One Red Flag |
| WP SK HOLDINGS LIMITED | 05134411 | 02/07/2008 | 23/07/2015 | Silver |
| WP SK LIMITED | 05134639 | 02/07/2008 | 23/07/2015 | Silver |
| WP SK MIDCO LIMITED | 05385905 | 02/07/2008 | 23/07/2015 | Bronze |