| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| European Pipeline Contractors Ltd | 03927347 | 11/02/2000 | Dissolved |
| ILLINGTON LIMITED | 01529627 | 08/07/2005 | Dissolved |
| LEYDEN CONSTRUCTION LIMITED | 01016858 | 08/07/2005 | Dissolved |
| MCNICHOLAS LEISURE SERVICES LIMITED | 00551145 | 08/07/2005 | Dissolved |
| MCNICHOLAS PIPELINE SERVICES LIMITED | 02696702 | 08/07/2005 | Dissolved |
| MCNICHOLAS PIPELINES LIMITED | 02696705 | 08/07/2005 | Dissolved |
| MCNICHOLAS SUPPLIES LIMITED | 00882356 | 08/07/2005 | Dissolved |
| THOMAS & SONS (PLANT HIRE) LIMITED | 00894269 | 08/07/2005 | Dissolved |
| W. T. MEEK LIMITED | 01104310 | 08/07/2005 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| BRIDGE HEATING LIMITED | 03890418 | 06/07/2012 | 29/06/2018 | One Red Flag |
| CLEAN EARTH SOLUTIONS LIMITED | 03747927 | 08/04/1999 | 12/07/2017 | Dissolved |
| KIER INTEGRATED SERVICES LIMITED | 00873179 | 19/04/2018 | 31/12/2021 | Bronze |
| LEYDEN TRANSPORT LIMITED | 00597757 | 08/07/2005 | 12/07/2017 | Dissolved |
| MCNICHOLAS COMMUNICATIONS LIMITED | 00681041 | 08/07/2005 | 12/07/2017 | Dissolved |
| MCNICHOLAS CONSTRUCTION (HOLDINGS) LIMITED | 01006026 | 17/11/2003 | 31/12/2021 | Amber |
| MCNICHOLAS CONSTRUCTION COMPANY LIMITED | 00468365 | 08/07/2005 | 12/07/2017 | Dissolved |
| MCNICHOLAS CONSTRUCTION SERVICES LIMITED | 01510892 | 01/10/1991 | 31/12/2021 | Amber |
| MCNICHOLAS HOME SERVICES LIMITED | 04242447 | 27/06/2001 | 12/07/2017 | Dissolved |
| MCNICHOLAS INTERNATIONAL LIMITED | 03186597 | 15/11/2005 | 12/07/2017 | Dissolved |
| MCNICHOLAS RAIL LIMITED | 09073385 | 09/06/2014 | 12/07/2017 | Dissolved |
| MCNICHOLAS UTILITIES LIMITED | 09073503 | 09/06/2014 | 12/07/2017 | Dissolved |