| Company | Timeline | Status | |
| Thames-Forth Limited Director • Director | 8 Dec 2005←16 Years→17 Nov 2022 | Dissolved | |
| Unicorn Preservation Society (The) Director • Director Marine Management | 25 Jan 1995←22 Years→27 Sep 2017 | Active | |
| Targe Towing Limited Director • Company Director | 17 Jun 1991←34 Years→Current | Active | |
| Roxburgh, Henderson & Company Limited Director • Marine Manager | 2 Jul 1990←1 Year→29 Jul 1991 | Dissolved | |
| Peterhead Towage Services Limited Director • Marine Manager | 14 Apr 1989←2 Years 3 Months→29 Jul 1991 | Dissolved | |
