| Company | Timeline | Status | |
| Costain Engineering & Construction (Overseas) Limited Director • Director | 28 Feb 1993←1 Year 8 Months→1 Nov 1994 | Active | |
| Costain Engineering & Construction Limited Director • Director | 28 Feb 1993←2 Years 7 Months→30 Sep 1995 | Active | |
| Richard Costain Limited Director • Director | 28 Feb 1993←2 Years 7 Months→30 Sep 1995 | Active | |
