| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Group Iv Communications Limited | 01983456 | 03/01/1992 | Dissolved |
| Laserfax Communications Ltd | 01943054 | 03/01/1992 | Dissolved |
| Macmillan Properties Ltd | 01968921 | 15/09/1995 | Dissolved |
| Macmillan Properties Ltd | 01968921 | 03/01/1992 | Dissolved |
| Principal Communications (Ashdown) Limited | 02299344 | 31/12/1990 | Dissolved |
| Principal Communications (Northern) Ltd | 02252762 | 15/09/1995 | Dissolved |
| Principal Communications (Northern) Ltd | 02252762 | 19/01/1991 | Dissolved |
| Principal Holdings Ltd | 01949470 | 15/09/1995 | Dissolved |
| Principal Holdings Ltd | 01949470 | 23/01/1992 | Dissolved |
| Principal Technical Services Ltd | 02160697 | 15/09/1995 | Dissolved |
| Principal Technical Services Ltd | 02160697 | 03/01/1992 | Dissolved |
| R T F Network Services Llp | OC347238 | 20/07/2009 | Dissolved |
| RTF MOBILE LTD | 09215762 | 15/09/2014 | Dissolved |
| RTF NETWORKS 2009 LTD | 06864016 | 31/03/2009 | Dissolved |
| Tunwish Ltd | 01697519 | 01/05/1997 | Dissolved |
| Tunwish Ltd | 01697519 | 19/01/1992 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| Graysal (Plant) Ltd | 02894243 | 03/02/1994 | 15/02/1994 | Dissolved |
| Principal Networks Ltd | 03246694 | 01/05/1997 | 19/09/1997 | Dissolved |
| RTF NETWORKS LIMITED | 07216448 | 28/04/2010 | 28/08/2018 | Dissolved |
| Tunwish Ltd | 01697519 | 15/09/1995 | 31/03/1996 | Dissolved |