| Company | Timeline | Status | |
Yorkshire Dry Dock Company,Limited(The) Director • Director | 1 Jan 1993←5 Years→31 Dec 1997 | Dissolved | |
Whitcrew Management (UK) Limited Director • Vice Chairman | 10 Jul 1992←5 Years→17 Apr 1998 | Dissolved | |
| John H. Whitaker (Management) Limited Director • Consultant | 10 Jul 1991←9 Years→5 Jun 2001 | Active | |
H. Raper Limited Director • Consultant | 10 Jul 1991←9 Years→5 Jun 2001 | Dissolved | |
| John H.Whitaker (Tankers) Limited Director • Consultant | 10 Jul 1991←9 Years→5 Jun 2001 | Active | |
John Harker,Limited Director • Consultant | 10 Jul 1991←9 Years→5 Jun 2001 | Dissolved | |
| John H. Whitaker (Holdings) Limited Director • Consultant | 10 Jul 1991←9 Years→5 Jun 2001 | Liquidation | |
